Why does a signal change when no vehicles are present?

If a signal is changing with no vehicles present, an error with our detection cameras may be occurring. Please contact the Streets Division using this form.

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1. Why do traffic lights take so long to change?
2. Why does a signal change when no vehicles are present?
3. Why aren’t signals put on a flash cycle late at night?
4. When traveling on some streets, red lights are hit on a regular basis? Can't they be coordinated?
5. Why isn't there enough green time at a signal to get the traffic through at some approaches?
6. Who takes care of state highways and traffic lights?