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Will a traffic signal reduce crashes at an intersection?
Traffic signals may not reduce crashes at an intersection. Typically, when a traffic signal is installed at an intersection, the total number of crashes increases, but the severity decreases. Traffic signals may result in a decrease in right-angle crashes. However, they may also result in an increase in rear-end crashes.

Public Works - Signals, Signage & Marking Maintenance

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1. What if there is a problem with a traffic signal?
2. How does the city decide where to install traffic signals?
3. Will a traffic signal reduce crashes at an intersection?
4. What should drivers do when the traffic signal is all dark?
5. Why do some traffic signals take so long to change?
6. Why are traffic signals synchronized on some streets and not on others?
7. Why don’t we allow more left turns on a green ball indication?
8. Why don’t we put in more left turn arrows at signalized intersections?
9. Why isn't there enough green time at a traffic signal to get the traffic through all approaches?
10. Why aren't traffic signals put in flashing operation late at night?
11. What do the symbols at a pedestrian countdown signal mean?

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