Development of estimation methodology for bicycle and pedestrian volumes based on existing counts.
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Development of estimation methodology for bicycle and pedestrian volumes based on existing counts.

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  • Abstract:
    The Colorado Department of Transportation (CDOT) adopted the Bicycle and Pedestrian Policy directive in 2009

    stating that "...the needs of bicyclists and pedestrians shall be included in the planning, design, and operation of

    transportation facilities, as a matter of routine..." While well intentioned, this policy directive remained difficult to

    fulfill without sufficiently accurate estimates of bicycle and pedestrian volume on CDOT facilities. This research

    project enables CDOT to answer the question of whether or not these road users are being adequately

    accommodated by establishing Colorado-specific methodologies for estimating bicycle and pedestrian volumes via a

    limited sample of existing counts. Because it is not economically realistic to collect continuous count data

    throughout the entire CDOT system, there is a need to establish procedures for handling bicycle and pedestrian data

    and calculations as well as methods for estimating annual bicycle and pedestrian use from short-term counts. This

    work will facilitate improved use of CDOT’s existing investments in collecting continuous and short-term bicycle

    and pedestrian count data. It will also enable CDOT to better understand the needs of bicyclists and pedestrians as

    well as best allocate limited resources in order to properly meet those needs.


    Using the factoring method presented in this report, CDOT can automate the estimation of AADB and AADBP, just

    as is currently done for motor vehicle traffic. Since the method is essentially the same and the grouping of the sites

    can be automated, this should not require significant staff time. By publishing the non-motorized traffic counts and

    annual average daily bicyclists (AADB) and annual average daily bicyclists and pedestrians (AADBP) estimates on

    its website, CDOT can share this processed data with local agencies throughout the state.

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