Legal Issues Most states have traffic laws that require drivers to stay to the right except when passing. Yet some drivers believe that as long as they are driving the speed limit, they have the right to drive in the left lane. Some states will ticket people for staying in the passing lane. Similarly, speed limits are set on interstate highways to enhance traffic flow, promote safety, and keep traffic moving. What are the laws in your state regarding the use of the passing lane and speed limits? Why are they needed?