probably differs city to city. in my city the main north-south and east-west arteries are one way. the greens are synchronized so that a vehicle traveling at or

probably differs city to city. in my city the main north-south and east-west arteries are one way. the greens are synchronized so that a vehicle traveling at or slightly below the speed limit will never hit a red light until it leaves the coordinated downtown area (with a couple exceptions when crossing other major arteries perpendicularly).