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Vehicular communication systems are computer networks in which vehicles and roadside units are the communicating nodes, providing each other with information, such as safety warnings and traffic information. They can be effective in avoiding accidents and traffic congestion. Both types of nodes are dedicated short-range communications devices. DSRC works in 5.9 GHz band with bandwidth of 75 MHz and approximate range of 300 metres. Vehicular communications is usually developed as a part of intelligent transportation systems.
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