Vehicle traffic monitoring using cellular telephone location and velocity data
US6810321B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2003 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Mar 17, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/0104
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A vehicular traffic monitoring system communicates with a plurality of mobile communication devices carried in moving vehicles and capable of determining their respective geographic positions and velocities. A data collector receives data samples from the plurality of mobile communication devices, each data sample comprising instantaneous location and velocity information of a respective mobile telephone at a respective time. A road segment identifier is coupled to the data at the collector for matching data samples wherein a respective instantaneous location corresponds to one of a plurality of road segments monitored by the traffic monitoring system. A sliding average calculator coupled to the road segment identifier determines an average speed corresponding to matched data samples for a particular one of the road segments in response to a predetermined sliding window. A state change detector coupled to the sliding average calculator detects a traffic state change at the road segment in response to the average speed in the predetermined sliding window determined at first and second times. A congestion alerting mechanism coupled to the state change detector routes notifications wh…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.