We have had several questions from residents of Country Place asking about safety concerns at the intersection of Prince of Wales and Amberwood. One specific suggestion has been to request the installation of a red light camera at this intersection. For those of you who aren’t familiar with this tool, these cameras are used to issue tickets to drivers who drive through a red light.
We have reached out to traffic safety staff on multiple occasions to ask about assessing various intersections for red light cameras, including Prince of Wales / Amberwood. The city has very clear criteria for determining which kinds of situations are best for the installation of red light cameras. Based on my conversations with city staff, they do not recommend Prince of Wales / Amberwood for such this tool, and they have also suggested that a red light camera could increase sfety risks at this intersection.
To help residents understand staff's position on this, we'd like to share the content from our conversations with staff. To do so, we'll break the information down into three segments. As you will read, due to the nature and history of collision categories at this intersection, and due to the purpose of red light cameras, we will likely need to pursue other solutions to concerns about this intersection. My office remains committed to traffic safety across Ward 9, and we will continue to work with city staff and communities to find the right solutions.
The first segment below are answers to specific questions that our office raised with a Senior Engineer on the City of Ottawa Road Safety Services team:
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Question: Can you confirm that the last assessment was based on data from 2017 – 2021?
- Response: Yes, the last screening exercise was based on 2017-2021 data set. Currently data up to 2022 is used for analysis.
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Question: What years will the new data be based on?
- Response: It is expected that the new data will be current up to 2024.
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Question: Can you let me know what a new “screening” consists of? Is that an on-site exercise, or is it simply running the more recent data up against screening criteria to make an assessment?
- Response: We would run the more recent data against the screening criteria.
In the second segment, the Senior Engineer provided more info on the assessment process. Please note that the following text is directly from the Senior Engineer:
Traffic Services conduct annual reviews of all signalized intersections to identify locations that would benefit the most from Red Light Cameras (RLC). RLCs are implemented to help mitigate angle collisions at intersections. The site selection process considers several factors including:
- Measurable safety benefits associated with the installation of an RLC are determined through network screening using safety performance functions (SPFs). These SPFs are utilized to estimate the expected collision frequency if an RLC is installed at an intersection, which is then compared to the safety performance without an RLC. The resulting difference provides the Collision Change (CC).
- Collision frequency, types (most importantly angle collisions) and severity.
If the location meets the two criteria above, a review of site conditions to determine if it’s physically possible to install camera equipment would be required. In certain instances, not all high collision locations may be equipped with red light cameras due to physical constraints.
As to the question of roughly when might this new data / new screening be happening later this year? Traffic Services Staff is currently working on validating 2023, 2024 collisions. Validation is an important step in the Road Safety Management process as we must ensure the data we work with is as accurate as possible.
This is typical practice in many road safety programs as the data is not immediately available to us as collisions occur. Traffic Services receives data on collisions that occur within the City of Ottawa from the Ministry of Transportation (MTO) on a continual basis. The collision data is provided to the MTO by policing agencies including the Ottawa Police Service, the Ontario Provincial Police and The Royal Canadian Mounted Police at varying intervals. The data is validated through the City’s collision management system to ensure there are no errors or missing information. Errors are addressed using MTO collision coding rules and staff may follow up with the reporting policing agency to gather additional information if available. Note: collision data is publicly released on a monthly basis via OpenData Ottawa once it is validated.
As soon as the full 2023 and 2024 collision data set becomes available, the screenings/ranking for all sites city-wide will be updated.
In the third segment, the Senior Engineer provided more info on the intersection of Prince of Wales and Amberwood (based on 2017-22 data):
A review of the validated collision data for the intersection of Prince of Wales and Amberwood, between 2017-2022, shows the following:
There were a total of 12 collisions occurring between 2017-2022. Of the 12 incidents:
- 0 resulted in fatal or major injuries
- 75.0% (9 of 12) of collisions were property damage only
- 25.0% (3 of 12) of collisions resulted in minimal or minor injuries
Also:
- 16.7% (2 of 12) occurred during poor weather conditions (rain, snow, freezing rain)
- 41.7% (5 of 12) occurred during dark conditions (dawn, dusk, dark)
Also:
- 91.7% (11 of 12) of collisions were related to rear end collisions (NOTE from Councillor Devine: this part is critical to the question of applicability of red light cameras at this intersection)
- 8.3% (1 of 12) of collisions were related to “other”
Given that there have not been any angle collisions at this intersection, it is unlikely that this location would be identified for RLCs. Previous studies have shown that RLCs significantly reduce the number of right-angle collisions but tend to increase the number of rear-end collisions. Research indicates that right-angle collisions are often more severe than rear-end collisions, making RLCs a valuable tool for reducing the overall severity of collisions at signalized intersections. The increase in rear-end collisions is typically due to drivers braking abruptly when approaching an RLC. A RLC may further increase the occurrence of rear end collisions without reducing the overall severity of collisions at this location.