a system for monitoring the flow of vehicular traffic comprising : a plurality of detectors that detect the passage of a vehicle along a predetermined roadway ; the detectors being powered by one of solar or wind power ; at least one transmitter for transmitting the data relating to the passage of a vehicle at a predetermined point on a roadway ; the transmitter being powered by solar or wind power ; and a second receiver for receiving the transmitted data relating to the passage of a vehicle along a predetermined roadway for use by a motorist in determining a route of travel . a method for monitoring the flow of vehicular traffic for purposes of determining a route of travel for motorists comprising : determining traffic speed at least one point along a roadway using a plurality of detectors that detect the passage of a vehicle ; the detectors being powered by one of solar or wind power , and transmitting the traffic speed using at least one solar powered transmitter for use by motorists in determining whether or not to select passage along the roadway containing the at least one point as a way to navigate through the region .