Abstract: A digital coded signal for horizontal overhead obstacles warning system comprises of an active transmitter mounted in the vicinity of the said horizontal overhead obstacles and a receiver unit in each automobile vehicle. The transmitter transmits a string of digitally encoded signal periodically with a brief interval in between e.g. millisecond range, where the digital code corresponds, to the road name leading to the obstacle or obstacles and the corresponding height. The string of the digital signal will be password protected and encoded with a specific number of start bits, end bits, and parity. The receiver units, which are self contained receive and decode the signal and then display the information on the front panel, and also projects it on the vehicle's wind shield at dim light condition. In order to overcome electrical engine noise and other stray RF frequencies, the receiver includes a band pass filter and a pulse width decoder.