Post on 26-Nov-2021
transcript
Presentation Outline
Background
• What are current conditions?
Data
• Trends
Issues Observed
• What did the team see?
Potential Solutions
• Current Scheduled Solutions
• Long Term Solutions
• Recommendations
Schedule
Background InformationPedestrian/Bicycle Facilities:
◦ Shared-use path (south side of Toliver Road), east of OR 213
◦ Nothing along OR 213
Traffic Volumes (ADT 2016):
◦ Toliver Road: 2,000 Vehicles
◦ OR 213:
o11,400 non truck vehicles
oTruck AADT 1,100 or 10.02%
o Single Unit: 700
oMulti Unit: 400
Posted Speed Limit:
◦ OR 213: 45 mph
◦ Toliver Road: 35 mph
Molalla Zoning and Future Growth
Intersection
• Molalla has a large population commuting to Portland each day
• Several more businesses are looking to come in –o Truck Supply on 213
between Toliver and 211 and
o A car repair shop on Toliver• More housing lots are being
developed
Stakeholder Concernso Queues are causing unsafe driving: aggression, impatience,
cutting across lanes. High complaint area and community is concerned about safety.
o The bus garage (First Student) for the schools is on the corner and struggle with the intersection.
o Businesses are seeing increased demand causing more deliveries to the area including propane, gas, and other basic resources.
o First responders have no room in the area when an accident occurs.
o Pedestrians are walking in ditches when it’s dry and the road when it isn’t. There is no where safe to cross.
o Drivers are consistently confused or miss the intersection.
Crash Data Trends: Intersection
◦ 2007 – 2017 reported crashes
◦ 2017 data is still considered preliminary
Data reviewed with trends found for:
◦ Severity
◦ Time of Day
◦ Year
◦ Age
◦ Collision Type
Data reviewed with no trends found:
◦ Month
◦ Day of Week
◦ Lighting
◦ Weather
◦ Road ConditionSource: https://katu.com/news/local/two-teens-injured-in-crash-near-molalla
Intersection Crash Trends: Severity
6
21
8
30
5
10
15
20
25
PDO Injury C Injury B Injury A
NU
MB
ER O
F R
EPO
RTE
D C
RA
SHES
(2
00
7-
20
16
)
MOST SEVERE INJURY
84% Injury Crashes
• Injury A – Most severe injury category• PDO – Property Damage Only
21 1
2
2
12 2
13
2
8
1
11 1
1 1
1
1
11
1
0
2
4
6
8
10
12
14
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
NU
MB
ER O
F R
EPO
RTE
D C
RA
SHES
YEAR
Injury A
Injury B
Injury C
PDO
Intersection Crash Trends: YearNote: 2017 data is preliminary and may be incomplete
12 crashes 32%
• 2016 shows a significant increase in crashes. • 2016 had approximately a 10% increase in traffic volumes potentially caused by
diversion from multiple construction areas, development, and other factors.
Intersection Crash Trends: Collision Type
1 1 2 24
1
12
2
21
1
2
42
1
0
2
4
6
8
10
12
14
16
18
NU
MB
ER O
F R
EPO
RTE
D C
RA
SHES
(2
00
7-
20
16
)
COLLISION TYPE
Injury A
Injury B
Injury C
PDO
17 crashes (45%)15 angle or turning
movement crashes (39%)
Observation:
– Drivers take small gaps after becoming impatient
WB left-turn in front of truck
Observation:
– High volume of trucks and large vehicles, requiring larger gaps
Truck waiting to turn from Toliver Road
Issue: Finding an appropriate gap to turn
Issue: Queues on OR 213 and Toliver Road
WB queues (from Toliver Rd)
Observation:• Vehicles waiting to turn left cause large
queues and impatience– WB approach experienced the longest
delays– SB direction was more random, but became
relatively long quickly– Waits as long as 2-4 minutes were observed
during the peak times
SB queues (from OR213)
Observation (Turning Radii):– High volume of large vehicles making
turning movements– Large trucks require both lanes to
complete turning movements – WB right is a tight movement
• Large vehicles (such as buses) off track the pavement
• Traffic Data:– 6% -18% truck traffic– E.g., 5% - 25% of large vehicles making
westbound left
Issues: Intersection Geometry
Truck turning WB right
Observation (Offset):– Drivers cut across the double yellow lines
to make a NB left turn
– Intersection has negative offset (east-west)• Toliver Road lefts
and throughs cannot go at same time
• This leads to confusion
Issues: Intersection Geometry
NB left cutting across centerline
Intersection offset: EB view from west leg (Toliver Road)
Issue: Intersection Visibility and Sight Distance
View of the intersection looking south
Observation:o Difficult to see vehicles at the intersection on Toliver
Road as you approach on OR 213 (SB)o Intersection lacks delineation, especially at night time o Existing illumination is focused on the side street and
offset from the intersectiono Vertical crest curve just north of the intersection
makes it difficult for NB left vehicles to see low-profile approaching vehicles
Observation:o Sight distance for the WB
approach is limited by slope and vegetation
o Vehicles encroach beyond stop bars on both sides of Toliver Rd
o Drivers lean forward to see trafficVehicle creeping out to see oncoming traffic View east leg of Toliver Road, looking north
Issue: Intersection Visibility and Sight Distance
Bus driver view: WB looking south Bus driver view: WB looking north
Photo Source: Greg Rants (First Student)
Corridor Design Issues: Shoulder
OR 213 shoulder and ditch
Observation:– Narrow shoulders (1-3’)– Steep and deep ditches– Results in minimal recovery
area for vehicles – No room in case of an
emergency– No room for pedestrians or
bicycles
• Crash Data:– 3 fixed object crashes (ditch)
Corridor Design Issues: Pedestrian
Pedestrian walking southbound on OR 213
Observation:– Lack of pedestrian and
bicycle facilities– Lack of shoulder– Pedestrians observed
walking on OR 213, many with their back to traffic
– Several pedestrians observed crossing OR 213
– No existing crosswalk
Short Term Solutions –FundedODOT ARTs Project (Construction – 2020)◦ Installing illumination
◦ Advanced Intersection Warning Signs with Street Names
◦ Transverse Rumble Strips on Approaches
◦ Reduce vegetation to increase site distance and make signs more visible
City of Molalla◦ Reduce vegetation to increase site distance and
make signs more visible on Toliver Rd
◦ Replace signage as needed
Source: ODOT Systemic Safety Measures: Basic Intersection Upgrades
Long Term Improvement ProjectGoal is to meet the needs of all users and increases safety.
Currently budgeted for shelf ready project • PE Only $700,000
High interest from the community, city, and ODOT for a safety solution
High interest for an operational improvement.
So what can we do?
Long Term Considered Solution 1Corridor cross-section change
◦ Will move turning traffic out of travel lane but does not address being able to find a gap to turn and increases the distance to cross.
◦ Queue in turn lane may block other intersections and driveways.
◦ Because of the queue space needed and tapering required, cannot build turn lanes - would have to do the entire length.
Long Term Considered Solution 2
Traffic signal ◦ Creates gaps for turning
◦ Increases queuing potentially to other intersections
◦ To have protected turns, needs full three lanes built.
CRF: (urban areas)
◦ Reduction of 67% in angle crashes
◦ Increase of 143% in rear-end crashes
Long Term Considered Solution 3Roundabout o Creates gaps for traffic, slows and calms traffic, provides visual clue that traffic is shifting from rural to urban.
CRF: 82% all injury crashes
Concept 1 (140’ ICD, centered on intersection) Concept 1 (125’ ICD, offset west of intersection)
Best Solution
Long Term Solutions
3 Lane Cross Section Traffic Signal RoundaboutO
bse
rved
Pro
ble
ms Finding A Gap Doesn’t address Will Fix Creates timing
Queues May Worsen Will Worsen DecreasesIntersection Geometry Will fix Doesn’t address Will Fix
Sight Distance Will fix Doesn’t address Will FixShoulder Design May Fix May fix Will Fix
Accidents May Reduce Increases ReducesPedestrians May Fix May Fix Will fix
• The solution with the best chance to increase safety for all problems observed is a roundabout Will slow traffic as it
enters the town Increases gaps for traffic
to safely merge Increases sight distance Fixes the geometry
problems Reduces Queues Reduces accidents
• Design will have to consider size for trucks in the appropriate sizing and include a truck apron
• Initial concept is for a single lane• Given constraints to either side of the road,
detours will most likely have to look to build the roundabout in sections
Final RSA Report: November 9th
ODOT will prepare a formal response following the Final RSA Report
Mobility Presentation Nov 20th
Solicit concerns and feedback for the design to be incorporated from the beginning.
City of Molalla Council Meeting in December
Design phase to begin in January
Schedule