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TRANSIT VEHICLES AS TRAFFIC PROBE SENSORS.
| 题名： | TRANSIT VEHICLES AS TRAFFIC PROBE SENSORS. |
| 作者： | Cathey-FW; Dailey-DJ |
| 关键词： | Algorithms-; Arterial-highways; Automatic-vehicle-location; Computer-graphics; Correlation-analysis; Freeways-; Kalman-filtering; King-County-Washington; Loop-detectors; Probe-vehicles; Real-time-information; Speed-measurement; Traffic-speed; Transit-buses; Travel-time; Virtual-sensors |
| 摘要： | New algorithms are presented that use transit vehicles as probes for determining traffic speeds and travel times along freeways and other primary arterials. A mass transit tracking system based on automatic vehicle location data and a Kalman filter used to estimate vehicle position and speed are described. A system of virtual probe sensors that measure transit vehicle speeds by using the track data is also described. Examples showing the correlation between probe data and inductance loop speed-trap data are presented. Also presented is a method that uses probe sensor data to define vehicle speed along an arbitrary roadway as a function of space and time, a speed function. This speed function is used to estimate travel time given an arbitrary starting time. Finally, a graphical application is introduced for viewing real-time speed measurements from a set of virtual sensors that can be located throughout King County, Washington, on arterials and freeways. |
| 总页数： | Transportation Research Record. 2002. (1804) pp23-30 (6 Fig., 10 Ref.) |
| 报告类型： | 科技报告 |
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