The cycle is entirely up to the local Department of Transportation be it a city, town or state. Where I live we have short cycle lights at heavy intersections a

The cycle is entirely up to the local Department of Transportation be it a city, town or state. Where I live we have short cycle lights at heavy intersections and long cycle lights at intersections where keeping the primary/heavy road going longer is 100000% more worth it than some side secondary road with 3 cars every hour. There are also plenty of complex areas where all the lights on a road are interconnected for miles and the timing is set to match between them to more efficiently feed cars onto highways and move them along.