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Ohio Standard Ohio Standard Small/Medium MPO Small/Medium MPO
Travel Demand Travel Demand Forecasting ModelForecasting Model
Network Coding TrainingNetwork Coding Training
May 9May 9thth, 2006, 2006
Highway NetworksHighway NetworksWhat are they?What are they?
Representations of the Representations of the streets, roads, thoroughfares, streets, roads, thoroughfares, and freeways that make up and freeways that make up
the regional highway system.the regional highway system.
Accurate RepresentationAccurate Representation If the network system data are accurate, the level If the network system data are accurate, the level
of effort needed to calibrate or validate the model of effort needed to calibrate or validate the model will be greatly reduced.will be greatly reduced.
Help to avoid questions from the “non-believers”. Help to avoid questions from the “non-believers”. (i.e. People who say the model is worthless when (i.e. People who say the model is worthless when it doesn’t favor their project.)it doesn’t favor their project.)
Garbage In – Garbage OutGarbage In – Garbage Out
Intersection (Junction) ModelingIntersection (Junction) Modeling
Network Checks & DefinitionsNetwork Checks & Definitions
Nodes and LinksNodes and Links
Network ConnectivityNetwork Connectivity
Link AttributesLink Attributes
Turn ProhibitorsTurn Prohibitors
Transit LinesTransit Lines
Nodes and LinksNodes and Links
Nodes are used to define Nodes are used to define intersections, merges, changes in intersections, merges, changes in direction, TAZ centersdirection, TAZ centers– Node number, X and Y coordinatesNode number, X and Y coordinates
Links connect two nodesLinks connect two nodes– Defined by the nodes they connect (A&B)Defined by the nodes they connect (A&B)– Many AttributesMany Attributes
Common Connectivity ErrorsCommon Connectivity Errors
Missing nodesMissing nodes
Missing centroid Missing centroid connectorsconnectors
Common Connectivity ErrorsCommon Connectivity Errors
Wrong way linksWrong way links
Excess linksExcess links
Common Connectivity ErrorsCommon Connectivity Errors
Centroids at non-Centroids at non-intersectionsintersections
Connect centroids Connect centroids to stub links to to stub links to better represent better represent intersectionsintersections
Common Connectivity ErrorsCommon Connectivity Errors
More than 4 links per More than 4 links per nodenode
Will not work with Will not work with intersection calculatorintersection calculator
Turn penalty Turn penalty calculator will report calculator will report these nodesthese nodes
Link AttributesLink Attributes
Link AttributesLink Attributes
Link AttributesLink Attributes Scrn_PenScrn_Pen – Screenline penalty in minutes – Screenline penalty in minutes
DistDist – Distance in miles – Distance in miles– Automatically calculated for new links, whenAutomatically calculated for new links, when links are split, and when nodes are moved (unless links are split, and when nodes are moved (unless
specified to Do Not Recalculate)specified to Do Not Recalculate)
PostSpdPostSpd - Posted speed limit in miles per - Posted speed limit in miles per hourhour
SpeedModSpeedMod – Speed adjustment in miles – Speed adjustment in miles per hourper hour
Link AttributesLink Attributes FunClassFunClass - the type of roadway based on - the type of roadway based on
operational characteristics - not Federal FCoperational characteristics - not Federal FC
Functional Class Categories:Functional Class Categories:– 10 - Freeway: divided highway, full access control10 - Freeway: divided highway, full access control– 20 - Expressway: divided highway, full or partial access 20 - Expressway: divided highway, full or partial access
control; includes limited access rural control; includes limited access rural arterialsarterials
– 30 - Ramp: entrance/exit for limited access facility30 - Ramp: entrance/exit for limited access facility– 40 - Arterial: serves major movement of traffic40 - Arterial: serves major movement of traffic– 50 - Collector: collects and distributes traffic from several 50 - Collector: collects and distributes traffic from several
access connectionsaccess connections– 60 - Local: only provides access to abutting properties60 - Local: only provides access to abutting properties– 70 - Centroid Connector: represents local access points70 - Centroid Connector: represents local access points
Link AttributesLink Attributes
AreaTypeAreaType - specific location/area within - specific location/area within networknetwork
Codes:Codes:– 1 - Rural: controlled intersections 2 miles apart1 - Rural: controlled intersections 2 miles apart– 2 - Suburban: residential development2 - Suburban: residential development– 3 - Urban: mixed residential and commercial3 - Urban: mixed residential and commercial– 4 - Central Business District: intense business 4 - Central Business District: intense business
activity; usually the downtown area of a activity; usually the downtown area of a citycity
– 5 - Outlying Business District: for roads with 5 - Outlying Business District: for roads with excessive access points compared to excessive access points compared to
density density (commercial strips)(commercial strips)– 6 - Low Access Urban: for roads with limited access, 6 - Low Access Urban: for roads with limited access,
such as access-controlled shopping areassuch as access-controlled shopping areas
Link AttributesLink Attributes
LanesLanes - number of mid-link through - number of mid-link through travel lanes, and default number of travel lanes, and default number of intersection through lanesintersection through lanes
TwidthTwidth - - directionaldirectional roadway width in roadway width in feetfeet
Link AttributesLink Attributes
TurnLaneTurnLane - indication of dedicated left - indication of dedicated left or right turning lanesor right turning lanes– 2-digit codes2-digit codes– 5-digit codes5-digit codes
Use 2-Digit codes when possibleUse 2-Digit codes when possible– First digit is the number of left turn lanesFirst digit is the number of left turn lanes
– Second digit is the number of right turn lanesSecond digit is the number of right turn lanes
– Illustrated: TURNLANE = 10Illustrated: TURNLANE = 10
Link AttributesLink Attributes
IXtypeIXtype - intersection type - intersection type– 0 = Pretimed (adaptive) signal0 = Pretimed (adaptive) signal– 1 = Interconnected signal1 = Interconnected signal– 2 = 2-way stop (1-way stop at T-intersections)2 = 2-way stop (1-way stop at T-intersections)– 3 = Uncontrolled intersection3 = Uncontrolled intersection– 4 = All-way stop4 = All-way stop
MedTurnMedTurn - indication of a mid-link median - indication of a mid-link median turn laneturn lane– Codes: 1 = median turn lane, 0 = no laneCodes: 1 = median turn lane, 0 = no lane– If median lane is coded, but no left turns coded If median lane is coded, but no left turns coded
at an intersection, a left turn lane is assumedat an intersection, a left turn lane is assumed
Link AttributesLink Attributes
ParkingParking - indicates on-street parking - indicates on-street parking during peakduring peak
– Blank: On-street parking is prohibitedBlank: On-street parking is prohibited– 0: Use only if Lanes field contains operating 0: Use only if Lanes field contains operating
number of lanes and on-street parkingnumber of lanes and on-street parking– 1: 1 lane is used for parking1: 1 lane is used for parking– 2: One-way street with parking on both sides2: One-way street with parking on both sides
Link AttributesLink Attributes
TerrainTerrain - accounts for link grade - accounts for link grade characteristicscharacteristics
Codes:Codes:– 1 = Level (<2% grade, 2-3% < 1 mi., 3-4% < 0.25 mi.)1 = Level (<2% grade, 2-3% < 1 mi., 3-4% < 0.25 mi.)
– 2 = Rolling (2-3% grade > 1 mi., 3-4% > 0.25 mi.,2 = Rolling (2-3% grade > 1 mi., 3-4% > 0.25 mi.,
5-6% < 0.3 mi.)5-6% < 0.3 mi.)– 3 = Mountainous (>4% grade > 0.3 mi.)3 = Mountainous (>4% grade > 0.3 mi.)
– Blank = accepts default code set in calculatorBlank = accepts default code set in calculator
Link AttributesLink Attributes
CarToll CarToll – Toll per mile for autos– Toll per mile for autos– 3.9 cents per mile3.9 cents per mile
TrkToll TrkToll – Toll per mile for trucks– Toll per mile for trucks– 12.9 cents per mile12.9 cents per mile
Link Attributes Being Phased OutLink Attributes Being Phased Out
IXTHRUIXTHRU
PCTTRKPCTTRK
CAPADJCAPADJ
Calculated Link AttributesCalculated Link Attributes
LNKGRPLNKGRP PEAKSPDPEAKSPD OFFPSPDOFFPSPD PEAKRSPDPEAKRSPD OFFPRSPDOFFPRSPD CAP24CAP24 SAT24SAT24
Other Link AttributesOther Link Attributes
AADTAADT SCNLINESCNLINE DISTRICTDISTRICT ADMCLASSADMCLASS RTENAMERTENAME RTENUMBRTENUMB COUNTYCOUNTY FEDFUNCFEDFUNC
Other Link AttributesOther Link Attributes
FedFunc - federal functional classFedFunc - federal functional class Don’t confuse with FunClassDon’t confuse with FunClassRural Rural UrbanUrban
01 - Interstate 01 - Interstate 11 - Interstate11 - Interstate
02 - Other Principal Arterial02 - Other Principal Arterial 12 - Freeway/Expressway12 - Freeway/Expressway
06 - Major Arterial 06 - Major Arterial 14 - Other Principal Arterial14 - Other Principal Arterial
07 - Major Collector 07 - Major Collector 16 - Minor Collector16 - Minor Collector
08 - Minor Collector 08 - Minor Collector 17 - Collector17 - Collector
09 - Local 09 - Local 19 – Local19 – Local
FunClass for rural principal arterial?FunClass for rural principal arterial?
POHIBITORS POHIBITORS ANDAND
TRANSIT TRANSIT
Turn ProhibitorsTurn Prohibitors
Text fileText file List of three nodes that define the List of three nodes that define the
turn movement prohibitedturn movement prohibited Each record also has a set number Each record also has a set number
and prohibitor definition (-1)and prohibitor definition (-1) Updating of file is Updating of file is semi-automaticsemi-automatic, ,
but for but for link splitslink splits only only File can also contain link penalty File can also contain link penalty
overrides (in minutes)overrides (in minutes)
Turn ProhibitorsTurn Prohibitors Example ListingExample Listing
2576 1656 401 1 -12576 1656 401 1 -1 2669 1657 1658 1 -12669 1657 1658 1 -1 2588 1750 2584 1 -12588 1750 2584 1 -1 2582 1756 2586 1 -12582 1756 2586 1 -1 2789 1805 2657 1 -12789 1805 2657 1 -1 2659 1807 2788 1 -12659 1807 2788 1 -1 2630 1854 2634 1 -12630 1854 2634 1 -1 2636 1856 2632 1 -12636 1856 2632 1 -1 1912 1926 1928 1 41912 1926 1928 1 4 1928 1926 1912 1 41928 1926 1912 1 4 1910 1930 2820 1 41910 1930 2820 1 4 2820 1930 1910 1 42820 1930 1910 1 4 2666 2162 2670 1 -12666 2162 2670 1 -1 2559 2563 2555 1 -12559 2563 2555 1 -1
Transit LinesTransit Lines
Text fileText file Route attributes and a listing of Route attributes and a listing of
nodes that define the routenodes that define the route Automatic updating feature when Automatic updating feature when
network changednetwork changed LINE NAME="1", MODE=1, ALLSTOPS=T, HEADWAY[1]=29, ONEWAY=F,LINE NAME="1", MODE=1, ALLSTOPS=T, HEADWAY[1]=29, ONEWAY=F,
XYSPEED=20, N=1206, -1280, 1282, -1284, -1286, 1296, -1326,XYSPEED=20, N=1206, -1280, 1282, -1284, -1286, 1296, -1326,
-1322, -1320, -1318, 936, 886, -934, -926, -906, 944, -832,-1322, -1320, -1318, 936, 886, -934, -926, -906, 944, -832,
-949, -830, 2878, 828, -578, -576, -574, -572, 570, 732, -568,-949, -830, 2878, 828, -578, -576, -574, -572, 570, 732, -568,
-566, -564, 2873, 476, 501, 421, 426, -2819, -424, 419-566, -564, 2873, 476, 501, 421, 426, -2819, -424, 419
Before Network EditingBefore Network Editing Open Turn Penalty Open Turn Penalty
(Prohibitor) File(Prohibitor) File
Display LocationsDisplay Locations– Node/Point ColorNode/Point Color– Use NumProh>0Use NumProh>0– Use NumPenalty>0 to view Use NumPenalty>0 to view
prohibitor and override prohibitor and override penaltiespenalties
Penalties not used in Penalties not used in junction modeling for junction modeling for nodes defined as nodes defined as junctionsjunctions
Turn ProhibitorsTurn Prohibitors
•At least one prohibitor per location shownAt least one prohibitor per location shown
Turn ProhibitorsTurn Prohibitors
View (Edit) ProhibitorsView (Edit) Prohibitors First use pointer to select a First use pointer to select a
nodenode
Turn ProhibitorsTurn Prohibitors
Saving changes to the prohibitor file is Saving changes to the prohibitor file is separate from saving network changesseparate from saving network changes
Use the disk icon in the Edit Penalties Use the disk icon in the Edit Penalties viewer to save prohibitor changesviewer to save prohibitor changes
Nodes will be temporarily be changed Nodes will be temporarily be changed when splitting a link, but the prohibitor file when splitting a link, but the prohibitor file must be savedmust be saved
Deleting links will leave stranded Deleting links will leave stranded prohibitorsprohibitors
Turn ProhibitorsTurn Prohibitors
To be safe, delete prohibitors firstTo be safe, delete prohibitors first– Click the movement in the penalty matrix and Click the movement in the penalty matrix and
delete prohibitor indicator (-1)delete prohibitor indicator (-1)– Add prohibitors back in after network changesAdd prohibitors back in after network changes– Turn penalty calculator will list turn prohibitor Turn penalty calculator will list turn prohibitor
movements that are not in the network movements that are not in the network (turn2000.log)(turn2000.log)
Arrow diagram in viewerArrow diagram in viewer– Left click for From LegLeft click for From Leg– Right click for To LegRight click for To Leg
Turn PenaltiesTurn Penalties Turn Penalty Calculator uses prohibitors in Turn Penalty Calculator uses prohibitors in
conjunction with default penalties based on conjunction with default penalties based on movement direction and link functional classesmovement direction and link functional classes
Left, Right, and Through movements calculated Left, Right, and Through movements calculated based on the angle between linksbased on the angle between links
Use Process Template…\[Turn Calculator 2000] to Use Process Template…\[Turn Calculator 2000] to view/change default valuesview/change default values
(value of 20 means 0.20 minutes)(value of 20 means 0.20 minutes)
Turn Prohibitor file can also contain Penalty Turn Prohibitor file can also contain Penalty override valuesoverride values
Turn PenaltiesTurn Penalties Complete penalties and prohibitors can also be Complete penalties and prohibitors can also be
viewedviewed
In junction modeling, penalties not used at ‘valid’ In junction modeling, penalties not used at ‘valid’ intersections:intersections:– Has 3 or 4 total linksHas 3 or 4 total links– Has 3 o 4 non-centroid linksHas 3 o 4 non-centroid links– Has at least 2 non-centroid entrance linksHas at least 2 non-centroid entrance links– Has at least one link of functional class 40, 50 or 60Has at least one link of functional class 40, 50 or 60– At least one of those non-centroid entrance links has an At least one of those non-centroid entrance links has an
IXTYPE other than 3 or all IXTYPE’s are blank IXTYPE other than 3 or all IXTYPE’s are blank
Before Network EditingBefore Network Editing
Add Transit LayerAdd Transit Layer
Layer Control \ Layer Control \ Transit \ Layer Transit \ Layer PropertiesProperties
Browse… Open Browse… Open Transit Line File Transit Line File (*.lin)(*.lin)
Transit LayerTransit Layer
All transit linesAll transit lines
displayeddisplayed
Transit ToolsTransit Tools– Display Transit Line(s)Display Transit Line(s)– Display All Transit LinesDisplay All Transit Lines– Transit Line ManagerTransit Line Manager
Add other transit linesAdd other transit lines
Display Transit \ Clear All \ OKDisplay Transit \ Clear All \ OK– Lines aren’t shown, but are still loadedLines aren’t shown, but are still loaded
Transit LayerTransit Layer
Splitting network Splitting network links used by a links used by a transit linetransit line– Must save the Must save the
transit line filetransit line file
Deleting network Deleting network links used by a links used by a transit linetransit line– Transit line will use Transit line will use
XYSPEED valueXYSPEED value
NETWORK EDITINGNETWORK EDITING
Editing ToolsEditing Tools
Pointing ModePointing Mode Zoom InZoom In Zoom OutZoom Out View Move (Pan)View Move (Pan) Post 1 NodePost 1 Node Post 1 LinkPost 1 Link RefreshRefresh Zoom AllZoom All Center on NodesCenter on Nodes Post NodePost Node Post LinkPost Link Node/Point ColorNode/Point Color Link/Line ColorLink/Line Color Band Width SettingsBand Width Settings Layer ControlLayer Control
Geometry and DirectionGeometry and Direction
OldOld
NewNew
IntersectionsIntersections
5-legged 5-legged IntersectionsIntersections– Merge 2 legs into a Merge 2 legs into a
stub link near the stub link near the intersectionintersection
– Do not code IXTYPE Do not code IXTYPE for these 2 linksfor these 2 links
– Stub IXTYPE is Stub IXTYPE is uncontrolled, and uncontrolled, and Distance = 0Distance = 0
IXTYPE
IntersectionsIntersections
Divided Highways Divided Highways ((at-grade signal)at-grade signal)
Divided Highways Divided Highways (end of division)(end of division)
Stop IntersectionsStop Intersections Stop ControlStop Control
– All-way stopAll-way stop– 2-way stop2-way stop
All traffic control All traffic control interruptions coded for interruptions coded for geometry, even if no geometry, even if no significant volume significant volume exists on a legexists on a leg
Do not have a centroid Do not have a centroid connected to a stopped connected to a stopped 3-legged intersection3-legged intersection
IXTYPE
Stop IntersectionsStop Intersections
Stop Control HCM LimitationsStop Control HCM Limitations– For 3-legged intersections, there cannot For 3-legged intersections, there cannot
be stops on only 2 legsbe stops on only 2 legs– For 4-legged intersections, there cannot For 4-legged intersections, there cannot
be two adjacent stops, unless it is an all-be two adjacent stops, unless it is an all-way stopway stop
If reality contradicts these rules, code If reality contradicts these rules, code the reality and let the junction the reality and let the junction calculator use it’s default methodologycalculator use it’s default methodology
Signalized IntersectionsSignalized Intersections
All incoming links to a signal node All incoming links to a signal node should be codedshould be coded
If even one leg is coded as If even one leg is coded as uncontrolled, the whole intersection uncontrolled, the whole intersection will be treated as partial stopwill be treated as partial stop
Do not have a centroid connected to Do not have a centroid connected to a signalized 3-legged intersectiona signalized 3-legged intersection
Intersection Turn LanesIntersection Turn Lanes
2-Digit Codes2-Digit Codes– First digit = left only lanesFirst digit = left only lanes– Second digit = right only lanesSecond digit = right only lanes
5-Digit Codes5-Digit Codes– First digit = left only lanesFirst digit = left only lanes– Second digit = shared left/through lanesSecond digit = shared left/through lanes– Third digit = through only lanesThird digit = through only lanes– Fourth digit = shared right/through lanesFourth digit = shared right/through lanes– Fifth digit = right only lanesFifth digit = right only lanes
Intersection Turn LanesIntersection Turn Lanes
Shared lanes assumed if movements are Shared lanes assumed if movements are allowed but no exclusive lanes are allowed but no exclusive lanes are specifiedspecified– One approach lane : all movements allowedOne approach lane : all movements allowed– Two approach lanesTwo approach lanes
One Left/Through laneOne Left/Through lane One Through/Right laneOne Through/Right lane
– Three approach lanesThree approach lanes One Left/Through laneOne Left/Through lane One Through only laneOne Through only lane One Through/Right laneOne Through/Right lane
Intersection Turn LanesIntersection Turn Lanes
Use 2-digit code when possibleUse 2-digit code when possible
When to use 5-digit codeWhen to use 5-digit code– Dual turn lane when one is sharedDual turn lane when one is shared– Through lanes is different from LANESThrough lanes is different from LANES
Default through lanes = LANESDefault through lanes = LANESEliminates the need to code IXTHRUEliminates the need to code IXTHRU
Try to code the middle digit (of 5)Try to code the middle digit (of 5)
5 Digit Turn Lane Coding5 Digit Turn Lane Coding
LANES, PARKING, IXTHRU, and LANES, PARKING, IXTHRU, and MEDTURN are all ignoredMEDTURN are all ignored
However, LANES, PARKING, and However, LANES, PARKING, and MEDTURN still affect the computation MEDTURN still affect the computation of saturation flow rate and should of saturation flow rate and should thus be maintained thus be maintained
Miscoded Turn LanesMiscoded Turn Lanes If there is no left turn allowed (but through If there is no left turn allowed (but through
and right exist) and left (or shared left) and right exist) and left (or shared left) lanes are codedlanes are coded If there were no right (or shared right) lanes If there were no right (or shared right) lanes
coded all lanes are simply shifted over 2 places coded all lanes are simply shifted over 2 places (left becomes through, shared left/through (left becomes through, shared left/through becomes shared right/through, and through becomes shared right/through, and through becomes right)becomes right)
If there were also right (or shared right) lanes If there were also right (or shared right) lanes coded, then all left and shared left lanes are coded, then all left and shared left lanes are added to through lanesadded to through lanes
This same process occurs in reverse if there This same process occurs in reverse if there are no right turns allowed.are no right turns allowed.
Miscoded Turn LanesMiscoded Turn Lanes
If there is no through movement If there is no through movement allowed (but there are left and right) allowed (but there are left and right) and left (or shared left) lanes are and left (or shared left) lanes are coded but no right (or shared right)coded but no right (or shared right)– The through lanes are moved to The through lanes are moved to
exclusive rightexclusive right
Intersection Turn LanesIntersection Turn Lanes
Median Turn Lanes (TWLTL)Median Turn Lanes (TWLTL)
If MEDTURN = 1 and If MEDTURN = 1 and nono exclusive left exclusive left turn lanes are coded, 1 Left Turn turn lanes are coded, 1 Left Turn Lane is assumedLane is assumed
If MEDTURN = 1 and exclusive left If MEDTURN = 1 and exclusive left turn lane is coded, Left Turn Lanes turn lane is coded, Left Turn Lanes used is the number coded.used is the number coded.
ATTRIBUTE CHECKINGATTRIBUTE CHECKING
Attribute CheckingAttribute Checking
Link/Line ColoringLink/Line Coloring
Link Annotation (Posting)Link Annotation (Posting)
CombinationCombination
Attribute CheckingAttribute Checking
Link/Line Link/Line ColorColor– Color/StyleColor/Style– SizeSize– CriteriaCriteria
Hierarchy of Hierarchy of conditionsconditions
Multiple SetsMultiple Sets
Attribute CheckingAttribute Checking
IXTYPE by link colorIXTYPE by link color
Attribute CheckingAttribute Checking
Attribute CheckingAttribute Checking Draw Offset = 3Draw Offset = 3
Attribute CheckingAttribute CheckingAttribute CheckingAttribute Checking Draw Offset = 3, post TurnLane (for Turnlane <>’00’)Draw Offset = 3, post TurnLane (for Turnlane <>’00’)
Attribute CheckingAttribute Checking
Link Splitting or Copy/PasteLink Splitting or Copy/Paste
TURNLANE
Attribute CheckingAttribute Checking Attributes that cause problems from splitsAttributes that cause problems from splits
– TURNLANETURNLANE– IXTYPEIXTYPE– AADTAADT– SCRN_PENSCRN_PEN
More problems from copyingMore problems from copying– RTENAMERTENAME– RTENUMBRTENUMB– DISTRICTDISTRICT– SCRNLINESCRNLINE– And more if a dissimilar type link was chosenAnd more if a dissimilar type link was chosen
Saving Attribute DisplaysSaving Attribute Displays
Save a Project FileSave a Project File– Typically with the same name as the Typically with the same name as the
network, but with a different file network, but with a different file extension (*.VPR)extension (*.VPR)
Project files can be used with other Project files can be used with other networksnetworks– Manually edit the VPR text file to read a Manually edit the VPR text file to read a
different network filedifferent network file– Save the network as a different file, then Save the network as a different file, then
save the project filesave the project file
JUNCTION CALCULATORJUNCTION CALCULATOR
Junction CalculatorJunction Calculator Automatically generates a Voyager format Automatically generates a Voyager format
junction file using link information that junction file using link information that was coded as part of the capacity was coded as part of the capacity calculator level of detail 3 updatecalculator level of detail 3 update
HCM intersection modeling procedures will HCM intersection modeling procedures will be applied during each iteration of traffic be applied during each iteration of traffic assignment to the turning movement at assignment to the turning movement at the modeled intersectionsthe modeled intersections
Intersection modeling can be viewed as Intersection modeling can be viewed as nothing other than dynamic turn penalties nothing other than dynamic turn penalties
Junction CalculatorJunction Calculator
More accurate representation of More accurate representation of system operation than is obtained system operation than is obtained from the link based BPR style volume from the link based BPR style volume delay curvesdelay curves
Eventual capability to export Eventual capability to export Voyager junction information to Voyager junction information to Dynasim to conduct operational level Dynasim to conduct operational level traffic microsimulationtraffic microsimulation
Junction CalculatorJunction Calculator
DifferencesDifferences– Saturation Flow RatesSaturation Flow Rates– Run Time SpeedsRun Time Speeds– Turn Penalties not usedTurn Penalties not used
Intersection Data FileIntersection Data File– Control TypeControl Type– Lane GeometryLane Geometry– Signal PhasingSignal Phasing
Junction CalculatorJunction Calculator
In junction modeling, intersection data In junction modeling, intersection data calculated for ‘valid’ intersections:calculated for ‘valid’ intersections:– Has 3 or 4 total linksHas 3 or 4 total links– Has 3 o 4 non-centroid linksHas 3 o 4 non-centroid links– Has at least 2 non-centroid entrance linksHas at least 2 non-centroid entrance links– Has at least one link of functional class 40, 50 Has at least one link of functional class 40, 50
or 60or 60– At least one of those non-centroid entrance At least one of those non-centroid entrance
links has an IXTYPE other than 3 or all IXTYPE’s links has an IXTYPE other than 3 or all IXTYPE’s are blank are blank
Junction CalculatorJunction Calculator
Intersection types generatedIntersection types generated– Adaptive (Actuated) SignalsAdaptive (Actuated) Signals– 2-way Stop2-way Stop– All-way StopAll-way Stop
Others allowedOthers allowed– Pretimed SignalsPretimed Signals– YieldYield– RoundaboutsRoundabouts
Inconsistent IXTYPEInconsistent IXTYPE
IXTYPE determined based on functional IXTYPE determined based on functional class and areatype comparisons (and class and areatype comparisons (and possibly counts if used)possibly counts if used)
Intersection areatype uses the following Intersection areatype uses the following priority order: rural, cbd, urban, suburbanpriority order: rural, cbd, urban, suburban– if any link is rural, the intersection is ruralif any link is rural, the intersection is rural– all links must be suburban for the intersection all links must be suburban for the intersection
to be suburbanto be suburban
IXTYPE DeterminationIXTYPE Determination
Rural IntersectionRural Intersection– If the main road is lower (better) functional If the main road is lower (better) functional
class than the minor the intersection is 2-way class than the minor the intersection is 2-way stop on the minor roadstop on the minor road
– If equal functional class and nonzero counts If equal functional class and nonzero counts exist on both the major and minor streets then exist on both the major and minor streets then the intersection is 2-way stop on the minor the intersection is 2-way stop on the minor road, all other rural intersections are all-way road, all other rural intersections are all-way stop (i.e. those with equal functional class stop (i.e. those with equal functional class where counts are not available where counts are not available
IXTYPE DeterminationIXTYPE Determination
Non-rural IntersectionNon-rural Intersection– Local main and local minor; 2-way stop Local main and local minor; 2-way stop
on minor if nonzero counts are available on minor if nonzero counts are available to define the minor street, otherwise all to define the minor street, otherwise all way stopway stop
– Collector main and local minor; are 2-Collector main and local minor; are 2-way stop on minorway stop on minor
IXTYPE DeterminationIXTYPE Determination
Suburban IntersectionSuburban Intersection– Arterial main and local minor are 2-way Arterial main and local minor are 2-way
stop on minorstop on minor– Collector main and collector minor are Collector main and collector minor are
2-way stop if nonzero counts are 2-way stop if nonzero counts are available to define the minor street, available to define the minor street, otherwise all way stopotherwise all way stop
All others are signalized.All others are signalized.
Adaptive Signal PhasingAdaptive Signal Phasing
Phase 1, Protected Left on Major Street (if Phase 1, Protected Left on Major Street (if exclusive left turn lanes on both exclusive left turn lanes on both approaches of major)approaches of major)
Phase 2, Right, Through, Permitted Left on Phase 2, Right, Through, Permitted Left on Major StreetMajor Street
Phase 2 or 3, Protected Left on Minor Phase 2 or 3, Protected Left on Minor Street (if exclusive left turn lanes on both Street (if exclusive left turn lanes on both approaches of minor)approaches of minor)
Phase 3 or 4, Right, Through, Permitted Phase 3 or 4, Right, Through, Permitted Left on Minor StreetLeft on Minor Street
Adaptive Signal TimingAdaptive Signal Timing
Cycle Length from 60 to 120 secondsCycle Length from 60 to 120 seconds
Through Phases from half the initially Through Phases from half the initially specified green time to 90 secondsspecified green time to 90 seconds
Protected Left Phases from 0 to 40 Protected Left Phases from 0 to 40 secondsseconds
Intersection DataIntersection Data
Load file created Load file created by junction by junction calculator (*.ind)calculator (*.ind)
Show locationsShow locations
Intersection DataIntersection Data
Intersection DataIntersection Data
Select a node with Select a node with intersection dataintersection data
Click the icon on Click the icon on the node the node information boxinformation box
Intersection Data EditorIntersection Data Editor
Intersection Intersection AttributesAttributes– Lane GeometryLane Geometry– PhasesPhases
Regular layoutRegular layout
Intersection Data EditorIntersection Data Editor
2 Phase2 Phase
4 Phase4 Phase
Intersection Data FileIntersection Data File
Text fileText file Can be modified to Can be modified to
be used as an be used as an overrideoverride
Save only lines Save only lines that correspond to that correspond to the nodes to be the nodes to be editededited
Always include first Always include first line (UNITS line (UNITS LENGTH=FEETLENGTH=FEET
Intersection Data OverrideIntersection Data Override
Open extracted intersection file with Open extracted intersection file with nodes to be modifiednodes to be modified
Use Intersection Data Editor to make Use Intersection Data Editor to make changeschanges– Allowed phasesAllowed phases– Phase timingPhase timing
Intersection Data EditorIntersection Data Editor
Vehicle and Vehicle and pedestrian pedestrian movementsmovements
Click to toggle Click to toggle on/offon/off– Green = onGreen = on– Red = offRed = off
Save, OKSave, OK
Intersection Data EditorIntersection Data Editor
Saves are only in a Saves are only in a bufferbuffer
Save Intersection Save Intersection Data FileData File
Save Intersection Save Intersection Data File As…Data File As…