Traffic receivers give your automotive navigation systems a much needed advantage. These navigation systems work by using the speed limits along your path to determine the fastest routs for you. By adding the capabilities of a traffic receiver to your unit, you dramatically increase your actual driving time. You will be warned of completely blocked highways and roads that you will want to avoid completely. They also give you information about slow traffic so you can choose to take an alternate rout if you are in a hurry. There are three methods for receiving this data so you will have no problem finding one that works in harmony with your navigation system. Two of them involve the use of antennas to receive the data. The third one uses bluetooth capabilities to transmit the information. A good navigation system will have this built right in. If yours doesn't, you can still take advantage of this service because Traffic receivers are made available as external additions to your system as well.