Improvements in or relating to traffic control

摘要

Existing traffic-light installations are fitted with additional emergency lighting 1 and audio alarm system 2 mounted on top of the traffic-light, or elsewhere, and may be enclosed in a clear perspex or acrylic dome or sphere 3 which may also incorporate a directionally variable Passive Infra Red (PIR) sensor 4 and an intermediate light support platform 5. The emergency light and audio alarm system are activated simultaneously in conjunction with the traffic-lights, by emergency or other authorised vehicles in transit, by means of an emergency radio or electronic signal transmitted to remote sensors or transponders, or by infra red wave or sound-activated or emergency light-activated sensors which in turn trigger the emergency traffic-light and advance warning systems in advance of the approaching vehicle. The interactive feedback from the traffic-lights to the onboard display in the vehicle via the two-way signal system confirms receipt and activation of the over-ride command, and may also provide additional information to the vehicle and to its central control computer. Once the junction has been passed safely the emergency over-ride systems are cancelled out by similar means. Installations may be triggered or cancelled out in sequence where appropriate. <IMAGE>