Here's a simple, almost no cost change in pedestrian walk signal timing that can reduce vehicle / pedestrian collisions by as much as 60%. Instead of illuminating the white pedestrian light at the same time as the green light for traffic, the pedestrian gets a few seconds head start. This puts them out into the intersection before drivers start to move, making them more visible.
Implementing this is part of the City of Surrey's Vision Zero program, Vancouver is piloting this at Davie and Burrard, and the District of Saanich has many examples as they started the change in 2019.
This study from UBC examines the before and after analysis of safety for leading pedestrian intervals.
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