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Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers.It is digitally coded using the ALERT C or TPEG protocol into Radio Data System (RDS) [1] carried via conventional FM radio broadcasts.
In telecommunications, a transponder is a device that, upon receiving a signal, emits a different signal in response. [1] The term is a blend of transmitter and responder . [ 2 ] [ 3 ]
On roadways around the United States, radio-frequency identification (RFID) transponders, supporting transceivers, antennas, and video cameras are the current standard for the collection of toll fees. This technology was invented during the 1970s and was implemented throughout the 1980s and 1990s.
In most systems, vehicles using the system are equipped with an automated radio transponder device. When the vehicle passes a roadside toll reader device, a radio signal from the reader triggers the transponder, which transmits back an identifying number which registers the vehicle's use of the road, and an electronic payment system charges the ...
As the vehicle enters the toll lane, sensors (1) detect the vehicle. The two-antenna configuration (2) reads a transponder (3) mounted on the vehicle's windshield. As the vehicle passes through the exit light curtain (4), it is electronically classified by the treadle (5) based on the number of axles, and the ETC account is charged the proper ...
E-ZPass is an electronic toll collection system used on toll roads, toll bridges, and toll tunnels in the Eastern, Midwestern, and Southeastern United States.The E-ZPass Interagency Group (IAG) consists of member agencies in several states, which use the same technology and allow travelers to use the same transponder on toll roads throughout the network.
Map data vendors such as Tele Atlas and Navteq create the base map in a GDF (Geographic Data Files) format, but each electronics manufacturer compiles it in an optimized, usually proprietary manner. GDF is not a CD standard for car navigation systems. GDF is used and converted onto the CD-ROM in the internal format of the navigation system.
Transponder encryption keys are user programmable, using a simple over-the-air protocol. Once correctly programmed, transponders may be "locked" through a separate command, which prevents further changes to the internal key value. [4] Each transponder is factory provisioned with a 24-bit serial number and 8-bit manufacturer code.