00626935

Component

http://onlinepubs.trb.org...trr/1992/1364/1364-021.pdf

https://scholar.google.co...+Lee&publication_year=1992

The development and field testing of an automatic vehicle classification (AVC) system in 1990 and 1991 are described. The system employs an inductance loop detector and a pair of photoelectric sensors emitting modulated infrared-spectrum light beams, which are reflected off raised pavement markers. The presence of a vehicle activates the loop detector, prompting the system to classify the passing vehicle. The pattern of the infrared light beam interruptions enables the system to infer the vehicle's speed, number of axles, and number of tires. The number of axles and tires defines the vehicle's class for assessing the proper toll. Signals from the activation go through a special microprocessor into a personal computer for interpretation, display, and recording. The system was tested initially at a high-speed (50 to 65 mph) Oklahoma Turnpike Authority site. Evaluation of the computer records and written field notes obtained during a 5-wk study indicated that the first-generation AVC system correctly classified about 95% of the 1,736 vehicles observed. After a review of the data and the number and type of errors found therein, it was concluded that the system software could be modified to correctly classify about 97% of the vehicles. The AVC system was subsequently modified and installed in four automatic vehicle identification toll-gate lanes on the Turner and Will Rogers turnpikes in Oklahoma, where vehicles with a special device on board are allowed to debit their toll account as they pass through without stopping. Evaluation of the AVC system operating in this environment is continuing.

This paper appears in Transportation Research Record No. 1364, Transportation Planning, Programming, Land Use, and Applications of Geographic Information Systems. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01404948

English

p. 179-185

1992

Transportation Research Record

0309054036

Figures (3) ; Photos (2) ; References (3)

Accuracy; Automatic vehicle identification; Infrared detectors; Loop detectors; Microprocessors; Personal computers; Software; Toll roads; Vehicle classification

Highways; Operations and Traffic Management; Planning and Forecasting; I21: Planning of Transport Infrastructure

TRIS, TRB

Feb 24 1993 12:00AM

• ANALYSIS OF TRANSIT SERVICE AREAS USING GEOGRAPHIC INFORMATION SYSTEMS
• APPLICATIONS OF GEOGRAPHIC INFORMATION SYSTEM-TRANSPORTATION ANALYSIS PACKAGES IN SUPERREGIONAL TRANSPORTATION MODELING
• APPLICATIONS OF WEIGH-IN-MOTION DATA IN TRANSPORTATION PLANNING
• AREAWIDE ESTIMATION OF VEHICLE TRIP GENERATION RATES FOR ROUTE 9A RECONSTRUCTION ON MANHATTAN'S WEST SIDE
• CALIBRATION AND ADJUSTMENT OF WEIGH-IN-MOTION DATA
• CHALLENGES CONFRONTING METROPOLITAN PORTLAND'S TRANSPORTATION DECISION SYSTEM
• CREATING A MUNICIPAL GEOGRAPHIC INFORMATION SYSTEM FOR TRANSPORTATION: CASE STUDY OF NEWTON, MASSACHUSETTS
• DECENTRALIZATION OF JOBS AND EMERGING SUBURBAN COMMUTE
• DIFFUSION OF TRANSPORTATION PLANNING APPLICATIONS IN METROPOLITAN PLANNING ORGANIZATIONS: RESULTS OF NATIONAL SURVEY
• FACTORS AFFECTING AUTOMOBILE OWNERSHIP AND USE
• GEOGRAPHIC INFORMATION SYSTEM-BASED TRANSPORTATION PROGRAM MANAGEMENT SYSTEM FOR COUNTY TRANSPORTATION AGENCY
• HIGHWAY PERFORMANCE MONITORING SYSTEM ANALYTICAL PROCESS APPLICATION TO KENTUCKY'S ADEQUACY PROGRAM
• LOCATION PLANNING FOR COMPANIES AND PUBLIC FACILITIES: A PROMISING POLICY TO REDUCE CAR USE
• MATCHING PLANNING STYLES AND ROLES IN TRANSPORTATION TO CONDITIONS OF UNCERTAINTY AND STATE TECHNOLOGICAL KNOW-HOW
• PHOENIX COMMERCIAL VEHICLE SURVEY AND TRAVEL MODELS
• PLANNING FOR TEXAS' NEEDS USING HIGHWAY PERFORMANCE MONITORING SYSTEM ANALYTICAL PROCESS
• PROPOSED METHOD FOR CALIBRATING WEIGH-IN-MOTION SYSTEMS AND FOR MONITORING THAT CALIBRATION OVER TIME
• ROADWAY LEVELS OF SERVICE IN AN ERA OF GROWTH MANAGEMENT
• STARTING A REGIONAL TRANSPORTATION PLANNING ORGANIZATION
• TRANSPORTATION NETWORK DESIGN USING A CUMULATIVE GENETIC ALGORITHM AND NEURAL NETWORK
• USE OF HIGHWAY PERFORMANCE MONITORING SYSTEM AND BRIDGE NEEDS AND INVESTMENT PROCESS FOR REPORTING CONDITIONS, NEEDS, AND PERFORMANCE TRENDS
• USE OF HIGHWAY PERFORMANCE MONITORING SYSTEM IN RECLASSIFYING RURAL HIGHWAYS IN SUPPORT OF NATIONAL HIGHWAY SYSTEM IN KANSAS