For some time, residents have been reaching out to my office regarding the traffic lights at Carp and Hazeldean Rd, requesting that advance left turning lights be installed travelling Eastbound on Hazeldean onto Carp (North toward the 417) and Northbound on Carp onto Hazeldean (West). Previous information has been shared in my newsletter on this intersection which you can review here and here.
I have been reviewing the matter with Traffic staff and would like to present residents with a poll on what options might be feasible to pursue further with staff.
Some general background information:
- In 2015, this intersection ranked 167th of 955 signalized intersections for accidents in the City with a total of 10 collisions (the highest ranking intersection had 60 collisions)
- The existing Carp southbound left-turn arrow (turning East onto Hazeldean) is permissive-protective. It is present due to the significant volume of southbound left-turn vehicles competing with the constant flow of northbound straight-through vehicles.
- Carp Road has two signal phases at the Hazeldean intersection:
- Southbound left-turn vehicles turn on the green arrow; then the amber arrow clears these left-turn vehicles from the intersection. This whole while, northbound is stopped with a red-ball display and southbound straight-through vehicles proceed on the green-ball display.
- All northbound and southbound vehicles are then presented with a green-ball display and may proceed (turn left, turn right, go straight) when it is safe to do so.
- Fully-protected left-turn signal phases facilitate left-turning traffic and usually improves the safety of the intersection for left-turning vehicles. It also separates the left turn movement and pedestrians wishing to cross the street.
- Left-turn arrows also result in longer cycle lengths, increased vehicle queueing, increased vehicle stopping, and increased vehicle delays.
- Pedestrian delays may be increased due to the overall increase in vehicle delay.
- Fully-protected left-turn signal phases display 24 hours per day. These left-turn arrows are not turned off at night.
Option 1 – Eastbound Hazeldean advance left traffic light
- Westbound Hazeldean will remain without advance left traffic light
- Traffic staff conducted a review of 12 hours of footage during morning rush hour over 2-month period
- Concluded that while high, traffic does not spill out of the left turn storage lane
- Low volume of west bound traffic to interfere with eastbound left turns
- Because a collision trend is not over-represented, intervention may create new unforeseen problems
Option 2 – Northbound (new) and Southbound (existing) Carp simultaneous advance left traffic lights
- The future proposed northbound left-turn arrow and southbound left-turn arrow will be fully-protected. Carp Road will have two signal phases at the Hazeldean intersection:
- Northbound left-turn and southbound left-turn vehicles turn on the green arrow; then the amber arrow clears these left-turn vehicles from the intersection. This whole while, northbound straight-through has a red-ball display and southbound straight-through has a red-ball display.
- Northbound left-turn vehicles and southbound-left turn vehicles are presented with a red-ball display and may not proceed at all. Northbound straight-through vehicles and southbound straight-through vehicles are presented with a green-ball display and may proceed (turn right, go straight).
- Modeling of this intersection indicates that with the proposed fully protected left turn operation, delays for vehicles wishing to turn left will increase between 40 and 50 seconds.
I encourage residents to vote on this poll below to share your thoughts with my office in a way that will allow me to share the information easily with traffic staff as to preferred options. Please note that the results of this poll are solely for measuring the input of residents and do not guarantee that either option will be implemented.
This poll will remain open until December 10th so I do encourage residents to share this page with other residents via email or social media. Please provide your name, address, and any additional comments in the comments section of the poll (no comments will be posted publicly).
Thank you for your input.