The objectives of the study were: (1) to refine and test a 35 mm sweep-sampling air-photo technique and (2) to measure various indices of traffic flow and driver behavior to determine the effect of interchange spacing on freeway operations. A 35 mm camera was mounted in a Cessna 182 light airplane. The plane was flown at 90 mph at a flight altitude of 3500 feet. Pictures were taken at a rate of one frame per second which provides for 30 minutes of continuous coverage per hundred foot roll of film. Data were reduced by a semi-automatic photo interpreter that provided a punched card output. The sweep sampling technique was found suitable for the type of study in question. Advantages and disadvantages of the technique are discussed in the report. Speed, volume, density relationships, weaving, and stoppages are also discussed. (Author)


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    Title :

    Research on Interchange Spacing and Driver Behavior Effects on Freeway Operation


    Contributors:
    T. W. Forbes (author) / J. J. Mullin (author) / M. E. Simpson (author)

    Publication date :

    1964


    Size :

    57 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English






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