Route guidance system for roadway vehicles
US4311876A · kind A · utility
54Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1978 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/662
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A central station of a route guidance system collects traffic data from various points of a city area and updates aural routing information stored in roadside remote stations at periodic intervals. A moving vehicle senses the location of a roadside station to transmit a coded destination signal thereto where it is decoded to retrieve desired routing information. The latter is compressed in time dimension and transmitted back to the vehicle for storage in a storage device which is later retrieved at such a rate as to reproduce the original aural information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.