Speed limit indicator
US6388578B1 · kind B1 · utility
30Cited by
5References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 18, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Jul 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/096783
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A speed limit indicator for, for example, a four-lane highway (1) having left lanes (3) and right lanes (4), the direction of travel indicated by the arrows. Road markings (11, 12 and 13) of different colors are used to provide an indication of the speed limit for the particular speed zone. The invention also provides a transmitter which is sited usually at the entrance to a speed zone and a receiver in a vehicle which are used to signal the speed limit to a driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.