Some vehicles have trouble keeping up with the speed of traffic. Look for these vehicles and adjust your speed before you reach them. Slow moving vehicles may have an orange triangle on the back as shown in the figure. This sign is a warning to slow down. Do not get impatient if you are behind one of these vehicles. The driver will usually try to pull over to the side of the road whenever possible to prevent traffic back-ups.
Farm tractors, animal-drawn carts, and road-maintenance vehicles are not designed for high speed travel and move slowly. Watch for large trucks and small, underpowered cars, and be patient, especially on long or steep hills where they lose speed. Also, when entering traffic, these vehicles take longer to get up to speed.