Why isn't there enough green time at a signal to get the traffic through at some approaches?

 The goal is to have enough green time to clear traffic at all times. During peak times the coordinated roadways which have higher traffic volumes are typically prioritized to move more traffic through the intersection. Some approaches or turn movements may have more delay as a result.

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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?