From a legal standpoint, bicycles are required to obey the same rules of the road as any other vehicle on the roadway. This means they are required to stop for stoplights and stop signs. They must follow the speed limit signs (usually not a problem except for when they are coming down some of our hills). They are required to have a white light on the front of the bicycle during the hours of darkness (from a half hour after sunset to a half hour before sunrise) and at least a red reflector on the rear of the bicycle. RCW 46.61.780 talks about the required lighting.