Why do traffic lights take so long to change?

Every signalized intersection has special coordination needs and may require various types of timing depending on a few factors such as traffic volume, speed, direction of travel, time of day. Specific questions about a traffic signal can be directed to the Broomfield Traffic Engineer at ________

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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?