초록 ▼

A traffic monitoring system comprises a set of in-road sensor arrays for providing signals in response to a vehicle traversing the sensor arrays, a processor unit for processing the signals to determine vehicle speed and specific parameters such as axle count and spacing, and a traffic signal or sig

A traffic monitoring system comprises a set of in-road sensor arrays for providing signals in response to a vehicle traversing the sensor arrays, a processor unit for processing the signals to determine vehicle speed and specific parameters such as axle count and spacing, and a traffic signal or sign controllable by the processor unit. The processor unit stores data specific to the site at which the traffic monitoring system is installed and uses the site-specific information and the specific parameters measured for the vehicle to determine whether or not to activate the traffic signal or sign. One embodiment is located before a steep downgrade and computes a safe descent speed for a vehicle to descend the downgrade and displays the safe speed on a roadside sign. Another embodiment is located before a curve, such as a highway exit ramp, and uses data such as ramp curvature and superelevation, together with vehicle height and class information to predict whether or not the vehicle will exceed a threshold speed for that vehicle to negotiate that curve without rollover. A third embodiment is located on a steep downgrade approaching a traffic signal controlled intersection and computes whether or not the vehicle is a “runaway”which cannot stop at the intersection if necessary, in which case the system pre-empts the traffic signal to ensure that the vehicle has right or way through the intersection. A video system records vehicles which prompted pre-emption.

대표청구항 ▼

A traffic monitoring system comprising: (i) a set of sensors which are disposed in a traffic lane approaching a hazard for providing signals indicative of the speed, and also indicative of at least the weight of a vehicle traversing the set of sensors; (ii) a processor having a memory for storing si

A traffic monitoring system comprising: (i) a set of sensors which are disposed in a traffic lane approaching a hazard for providing signals indicative of the speed, and also indicative of at least the weight of a vehicle traversing the set of sensors; (ii) a processor having a memory for storing site-specific dimensional data related both to the hazard and to signals from said set of sensors; and (iii) a traffic signalling device associated with said traffic lane and disposed downstream of said set of sensors, said traffic signalling device being controlled by said processor; said processor being responsive to said signals from said set of sensors for computing a computed vehicle speed and a derived maximum vehicle speed, said derived maximum vehicle speed being derived from said site-specific dimensional data and from at least said weight of said vehicle, said derived vehicle speed being a maximum speed for said vehicle to negotiate said hazard, said processor comparing said computed vehicle speed with said derived maximum vehicle speed and operating said traffic signalling device if said computed vehicle speed exceeds said derived maximum vehicle speed.