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Active Communities/Transportation (ACT) Research Group

Krista Nordback Presents on Bicyclist Counting and Safety at TRB

1/25/2013

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COUNTING BICYCLISTS

The Bicycle and Pedestrian Data Subcommittee of the Transportation Research Board (TRB) hosted a Workshop entitled Factoring Bicycle and Pedestrian Data on Sunday, January 13. Krista Nordback spoke on the topic of estimating Annual Average Daily Bicyclists (AADB) and how long should bicyclists be counted in order to minimize error.  The analysis resulted in specific recommendations:
- Install more than 5 permanent bicycle counters per factor group.
- Short-term counts: 
    Are best collected May through October in northern climates.
    Optimal length is 7 days (24 hrs per day), but shorter counts can still be useful.

  Her complete presentation may be downloaded below.
how_many_hours_do_i_need_to_count2.pdf
File Size: 4720 kb
File Type: pdf
Download File

BICYCLIST SAFETY

On Monday, January 14, Dr. Nordback presented on the topic of bicyclist safety at urban intersections and presented the first bicyclist safety performance function for a city in the United States.  The analysis shows that individual bicyclist risk of collision with a motorist is substantially lower at intersections with more than 250 bicyclist per day (AADB) passing through the intersection in the study city, Boulder, Colorado.  In other words, cyclists are safer in numbers.  The presentation can be downloaded below.
bikespfforuscity.pdf
File Size: 2796 kb
File Type: pdf
Download File

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Adjusting for Variation in Bike Counts

4/7/2012

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Picture
The following is a guest post on Dr. Krizek's blog from Krista Nordback, PhD Candidate in Civil Engineering at the University of Colorado Denver and member of the Active Communities / Transportation (ACT) Research Group---

With the bicycle arms race underway (which is a good thing because peer pressure always helps communities do more), it’s really hard to know who is winning.  If you read the blurbs, every city claims to be winning because every city is seeing gains in their bicycle counts. But how consistent are the counting approaches? How robust are the counting approaches? Even with consistent and robust approaches, how does one account for geographic or climate variations. Does a high bike count in Minneapolis during a sunny and 70 degree day ensure the same in mid January?  Probably not.  (more)

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