If the driver of the other vehicle is making a left turn. Never drive off the road or pass to the left of a driver who is signaling a left turn. Don't honk when you pass on the right. If you need to move into another lane, move only after you have finished a turn you want to make and when traffic is clear. On-Ramps Carpooling and bus riding are useful ways to save fuel and reduce the number of vehicles using highways in heavy commute traffic.
Some freeways have special lanes and on-ramps for carpools.
Do not cross over the double parallel solid lines to enter or exit any carpool lane except at designated entry or exit places. Some freeways may have a special lane for buses only, or buses and carpools. This lane is also marked by the diamond symbol. Unless otherwise posted, motorcycle riders may use designated carpool lanes. Vehicles towing trailers are typically not allowed to use a carpool lane because they are restricted to the right-hand lane.