| 摘要 |
1462951 Road-traffic signalling-apparatus AUTOMATIC REVENUE CONTROLS (EUROPA) Ltd 15 Jan 1974 [15 Jan 1973] 01785/74 Heading G4Q Tyre width detection utilizes a pair of elongated wheel detectors at an angle α to the direction of vehicle travel. For automatic toll systems signals generated in each detector are monitored to compare their relative times of occurrence: if the two signals overlap it indicates two tyres at the end of the axle. In the embodiment α is such that: where a 1 , a 2 , b 1 , b 2 are as indicated in Figs. 1, 2. The detectors are pressure-operated pads. |
