Roadway deviation prevention system
US6064301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1999 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Feb 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/167
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A roadway deviation prevention system prevents a vehicle from deviating from the roadway. This roadway deviation prevention system has an on-vehicle transceiver which transmits a vehicle presence signal having a prescribed frequency, and data carriers, which are installed on a road, for emitting a warning signal resonating with the vehicle presence signal when the vehicle comes close to the data carriers. The on-vehicle transceiver has an annunciator which generates an alarm sound to inform the presence of the data carriers to the driver of the vehicle based on an induced voltage generated in the transceiver unit by the electromagnetic induction of the warning signal. The data carrier emits the warning signal based only on the energy generated when the resonance circuit receives the vehicle presence signal. Thus, this data carrier operates with no power source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.