55 mph. {Ans: on a two lane undivided highway, the maximum speed limit for vehicles towing trailers is _____ unless otherwise posted.}a white line separates two lanes traveling in the same direction. if its a broken line, you may cross it to pass or change lanes. if its a solid line, you should usually stay in your lane. {Ans: what does a white line do?}in fog, snow, or heavy rain. {Ans: you must use your high beam headlights in all of the following situations, except}the vehicle cannot travel faster than 25 mph a triangular orange emblem on the rear of a vehicle identifies it as a slow moving vehicle, which California defines as a vehicle that cannot travel more than 25 mph. slow moving vehicles are required by law to display this emblem. slow moving vehicles include farm tractors and road maintenance vehicles. if you are behind one of these vehicles, be patient. typically, the driver will pull over to the side to prevent backups when possible. {Ans: a triangular orange sign on the rear of a vehicle indicates that}follow directions from the person in charge of the animals. if drivers see animals or livestock, they