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Suggestion Title: Intersection: Protected left turns
Suggestion Description: Add an additional dedicated left turn lane on each highway side on the approach to the intersection, causing all lanes to narrow slightly. Re-add the dedicated left turn traffic signals for these lanes.
If a vehicle is detected in the left turn lane, cycle the traffic lights to provide protected left turns for that side.
Add decals to the main intersection road to act as lane guides for merging and the protected left turns.
Why should this be added?:
+ Directly tackles the main cause of collisions on the intersection (T-bones), ensuring that all drivers with a green light have an unobstructed right of way and thus hopefully dramatically reducing accidents
+ Clears up ambiguity with left turn signal (right now the left turn green light means nothing, as it does not stop traffic in the other direction)
+ Straight on and right-turning traffic now have a less interrupted and more predictable route as left turning traffic is in a dedicated lane
+ Lane narrowing forces a reduction in speed, reducing severity of collisions and providing a longer reaction time
What negatives could this have?:
- Requires a redux of the intersection traffic signal logic (which is already required tbh as right now it is inadequate)
- Lane narrowing and more frequent protected left turns may cause issues for vehicles violating the red lights often, however this is against the rules and not encouraged
Useful Images:
attached below is a professional sketch commissioned to an infrastructure engineer
Suggestion Description: Add an additional dedicated left turn lane on each highway side on the approach to the intersection, causing all lanes to narrow slightly. Re-add the dedicated left turn traffic signals for these lanes.
If a vehicle is detected in the left turn lane, cycle the traffic lights to provide protected left turns for that side.
Add decals to the main intersection road to act as lane guides for merging and the protected left turns.
Why should this be added?:
+ Directly tackles the main cause of collisions on the intersection (T-bones), ensuring that all drivers with a green light have an unobstructed right of way and thus hopefully dramatically reducing accidents
+ Clears up ambiguity with left turn signal (right now the left turn green light means nothing, as it does not stop traffic in the other direction)
+ Straight on and right-turning traffic now have a less interrupted and more predictable route as left turning traffic is in a dedicated lane
+ Lane narrowing forces a reduction in speed, reducing severity of collisions and providing a longer reaction time
What negatives could this have?:
- Requires a redux of the intersection traffic signal logic (which is already required tbh as right now it is inadequate)
- Lane narrowing and more frequent protected left turns may cause issues for vehicles violating the red lights often, however this is against the rules and not encouraged
Useful Images:
attached below is a professional sketch commissioned to an infrastructure engineer
