What pedestrian walking speed should normally be used when timing pedestrian intervals for traffic control signals?

The commonly accepted walking speed for timing pedestrian intervals at traffic control signals is 3.5 feet per second. This standard takes into account the average walking speed of individuals, which can vary based on a range of factors such as age, physical ability, and environmental conditions. By using 3.5 feet per second, traffic engineers accommodate most pedestrians while ensuring that signal timing promotes safety and accessibility.

Utilizing this speed helps to create pedestrian intervals that are efficient and allow sufficient time for individuals to cross roadways safely. It's essential for traffic signal timing to reflect a realistic expectation of walking speed, as this influences the overall safety and operational efficiency of the intersection. Thus, adopting 3.5 feet per second as the standard ensures that traffic control signals provide an adequate interval for crossing, reducing the risk of accidents and enhancing pedestrian flow.