AUTOMATIC JOURNEY TIME - SPOT SPEED DATA ACQUISITION SYSTEM
The object of this system is to collect data for the construction of spot speed contour plots as a function of time of day and distance along a freeway section. These contour plots can be used as a diagnostic tool to identify recurrent congestion and bottlenecks. A transducer converts distance travelled into electric pulses. Timing is supplied by an electronic clock housed in a portable battery-operated microcomputer-based logging instrument. The data are first stored in memory, then written onto cassette tape. In turn, cassettes are read into a mainframe computer where suitable programs generate contour plots. The logging instrument described can also be used for the automatic collection of traffic parameters by means of inductive loops. (Author/TRRL)
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Corporate Authors:
National Institute for Transport & Rd Res S Af
P.O. Box 395
Pretoria 0001, Transvaal, South Africa -
Authors:
- Shaw, I S
- Skowronski, W M
- Publication Date: 1983-9
Media Info
- Features: Figures; References; Tables;
- Pagination: 26 p.
Subject/Index Terms
- TRT Terms: Automatic control; Automation; Bottlenecks; Charts; Contour maps; Corrugating; Data collection; Digital computers; Electronics; Equipment; Freeways; Location; Logging (Recording); Loop detectors; Microcomputers; Speed; Spot speed; Time; Traffic congestion; Transducers; Travel time; Trip length
- Uncontrolled Terms: Micro
- ITRD Terms: 3882: Automatic; 6486: Chart; 632: Congestion (traffic); 8623: Data acquisition; 8673: Digital computer; 6965: Electronics; 3674: Equipment; 697: Journey time; 9061: Location; 9045: Micro; 2752: Motorway; 5408: Speed; 5414: Time; 6140: Transducer
- Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 00392497
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Report/Paper Numbers: RT/14/83 Monograph
- Files: ITRD, TRIS, ATRI
- Created Date: Apr 29 1985 12:00AM