15 Group C1: Corridor Alternatives Horizontal Curve Realignments Those curves that do not meet the minimum standards require reconstruction or acceptance of a below-standard curve with advisory signage. The following tables list the curves that will be reconstructed to meet the design standards for the posted speed. Curve No. Existing Radius Alt. 1 (DS 100 km/h) Alt.2 (DS 80 km/h) Alt.3 (Comb. DS 80/90 km/h) H1* 230 H2* 500 H3 370 H4 320 H5 285 H6 215 H7 350 H8* 295 H9* 90 Total 's 6 2 2 Legend Existing does not meet standard Meets standard * Within end intersection transition zone (posted speed of 50 km/h)
Transcript
15
Group C1: Corridor
Alternatives Horizontal Curve Realignments Those curves that do not meet the minimum standards require reconstruction
or acceptance of a below-standard curve with advisory signage. The following
tables list the curves that will be reconstructed to meet the design standards
for the posted speed.
Curve No.
Existing
Radius
Alt. 1 (DS
100 km/h)
Alt.2 (DS
80 km/h)
Alt.3 (Comb. DS
80/90 km/h)
H1* 230
H2* 500
H3 370
H4 320
H5 285
H6 215
H7 350
H8* 295
H9* 90
Total 's 6 2 2
Legend
Existing does not meet standard
Meets standard
* Within end intersection transition
zone (posted speed of 50 km/h)
16
Group C1: Corridor
Alternatives Vertical Curve Realignments
Curve No.
Existing K-
Value
Alt. 1 (DS 100
km/h)
Alt.2 (DS 80
km/h)
Alt.3 (Comb.
DS 80/90 km/h)
V1* 14
V2* 10
V3* 11
V4 55
V5 13
V6 25
V7 21
V8 38
V9 75
V10 119
V11 36
V12 33
V13 41
V14 36
V15 91
V16 45
V17 46
V18 36
V19 15
V20 35
V21 39
V22 37
V23 36
V24 41
V25 26
V26 30
V27 90
V28* 46
V29* 33
Total s 21 7 11
Legend
= Existing Does not meet standard = Meets standard
* = Within end intersection transition zone (posted speed of 50 km/h)
Evalu
ati
on o
f Corr
idor
Alt
ern
ati
ves
17
18
Intersection Group I1
County Road 20/County
Road 18
19
Evaluation of Alternatives Intersection Group I1 County Road 20/County Road 18
Alt 0
Do
Nothing
Alt 1
Left Turn
Lane
Alt 2
Signals
Alt 3
Roundabout
Transportation
Accommodates Longer Term Traffic Demands
Accommodates Farm Equipment
Safety for Vehicles - - -
Design Consistency
Natural Environment
Impact on Trees
Social Environment
Opportunity for Gateway Features
Noise Impacts -
Property Impacts
Residential Property Required - - - -
Farmland Property Required - - -
Cost
Life Cycle Cost Low Low Medium High
Recommendation
The existing configuration (slip-around lane) accommodates existing travel demand, and does not warrant
signals within the 20 year planning horizon. (A roundabout may be recommended when signals are
recommended). Left turn movements from CR18 to CR20 are minimal and storage is not required.
20
Intersection Group I1 County Road 20/County Road 18 Technically Preferred Alternative
21
Intersection Group I2
CR20/Holden Road/Long
Point Road
22
Intersection Group I2
CR20/Holden Road/Long
Point Road
Alt 0
Do Nothing
Alt 1A
Offset T
Intersection
Alt 1B
Realigned
Side Street
Alt 1C
Realigned and
Relocated
Side Street
Alt 2
Roundabout
Transportation
Accommodates Longer Term
Traffic Demands
Number of Intersections on
CR20 1 2 1 1 1
Accommodates Farm
Equipment
Safety for Vehicles - - -
Design Consistency
Natural Environment
Impact on Trees
Social Environment
Opportunity for Gateway
Features
Compatibility with Special
Character Road
Property Impacts
Residential Property
Required -
Farmland Property Required
Driveway Realignment
Cost
Life Cycle Cost Low Medium Medium High High
Recommendation
Alternative 1B reduces the skew angle of the existing intersection and accommodates the turning movements at a low
cost to improve traffic operations and safety. Based on forecast demand, the intersection does not warrant a
roundabout. The safety of a single roundabout is considered to outweigh the additional property required.
23
Intersection Group I2 CR20/Holden Road/Long Point Road Technically Preferred Alternative
24
Intersection Group I3
County Road 20/Poplar Point
Road
25
Intersection Group I3
County Road 20/Poplar Point
Road
Alt 0
Do
Nothing
Alt 1
Realigned Side
Approach
Transportation
Accommodates Longer Term Traffic Demands
Accommodates Farm Equipment
No Skew Angle (i.e. <70°)
Safety for Vehicles -
Design Consistency
Natural Environment
Impact on Trees
Social Environment
Opportunity for Gateway Features
Property Impacts
Residential Property Required
Farmland Property Required
Cost
Life Cycle Cost Low Medium
Recommendation
Alternative 1 reduces the skew angle of the existing intersection and
accommodates the turning movements at a low cost to improve traffic
operations and safety.
26
Intersection Group I3 County Road 20/Poplar Point Road Technically Preferred Alternative
27
Intersection Group I4
County Road 20/Centre Line
28
Intersection Group I4
County Road 20/Centre Line
Alt 0
Do
Nothing
Alt 1
Roundabout
Transportation
Accommodates Longer Term Traffic Demands
Accommodates Farm Equipment
Safety for Vehicles -
Design Consistency
Natural Environment
Impact on Trees
Social Environment
Opportunity for Gateway Features
Property Impacts
Residential Property Required
Farmland Property Required -
Cost
Life Cycle Cost Low High
Recommendation
The current intersection alignment safely accommodates the existing
turning movements. The Special Character Road design will include
localized median bulb-outs to reduce speeds within the limits of the
intersection and therefore the roundabout design is not warranted.
29
Intersection Group I4 County Road 20/Centre Line Technically Preferred Alternative
