Vehicular traffic detection system

Claim 1

IN A SYSTEM FOR DETECTING THE PRESENCE OF VEHICULAR TRAFFIC IN AT LEAST ONE DETECTION ZONE DEFINED BY A BEAM OF REPETITIVE ENERGY PULSES DIRECTED ACROSS THE PATH OF SAID VEHICLES COMPRISING IN COMBINATION, TRANSMITTING MEANS INCLUDING AT LEAST ONE TRANSDUCER POSITIONED AND DIRECTED TO TRANSMIT SAID PULSES ACROSS SAID PATH AND INCLUDING MEANS FOR INTERMITTENTLY ENEGIZING SAID TRANSDUCER AT A PREDETERMINED REPETITION RATE, RECEIVING MEANS FOR EACH SAID DETECTION ZONE INCLUDING A RECEIVING TRANSDUCER FOR RECEIVING REFLECTIONS OF SAID PULSES FROM THE REFLECTIVE SURFACES OF SAID VEHICLES TO BE DETECTED, OUTPUT MEANS, GATING MEANS COUPLED BETWEEN SAID RECEIVING MEANS AND SAID OUTPUT MEANS AND SUPPLYING SIGNALS TO SAID OUTPUT MEANS ONLY IN RESPONSE TO REFLECTION PULSES RECEIVED WITIN A PREDETERMINED TIME INTERVAL OCCURRING BETWEEN SUCCESSIVE OF SAID TRANSMITTED PULSES AND ENCOMPASSING THE EXPECTED RECEPTION TIME BY SAID RECEIVING TRANSDUCER OF REFLECTION PULSES FROM SAID VEHICLES IN RESPONSE TO THE LAST-TRANSMITTED PULSE, SAID OUTPUT MEANS INCLUDING MEANS NORMALLY IN AN INACTIVE CONDITION AND ALSO INCLUDING MEANS FOR OPERATING SAID NORMALLY INACTIVE MEANS FROM ITS NOMAL CONDITION ONLY ONCE THROUGHOUT ANY SAID PREDETERMINED TIME INTERVAL AND ONLY IN RESPONSE