Development of estimation methodology for bicycle and pedestrian volumes based on existing counts.
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2013-10-01
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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.
Implementation
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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