Abstract: A system for the programmed flashing of a plurality of highway warning lights includes a plurality of slave receivers each associated with a warning light to be mounted on respective barricades along with one or more master transmitters associated with certain receivers and warning lights. The master transmitter provides a coded signal which causes the warning lights to flash either in synchronization or in a predetermined sequence. Fail safe operation is provided by the use of a substitute master if the original master is disabled. The programmed flashing provides for greater depth perception by the approaching driver.