Reconstruction of vehicle collisions with bicyclists

Time and Location

Wednesday, September 20th, 1:00 PM (total time 4 hours)
1003 Kemper Hall (southeast corner of building)



The widespread use of portable GPS systems and applications is a boon for avid bicyclists who want to monitor performance and progress. These systems are also assumed to be a boon for crash reconstruction experts wanting to analyze the time-speed-distance relationships in the last few seconds leading up to and following a bicycle crash. However, how useful are these systems in bicycle crash reconstruction? The following two possible interactive data gathering exercises will provide participants insight into the advantages/limitations of GPS data, and will shed light on how best to interpret GPS data particularly in non-steady state conditions.

Exercise 1
This workshop will provide participants sample GPS data from a previously travelled timed route, and provide the workshop participants 10 minutes to reconstruct the simple time-speed-distance profile for the route, including determining maximum speed, speed at the last two or three data points, etc.
Exercise 2
Volunteer participants will then each be asked to cycle a prescribed loop three times, gathering GPS data on each run. The data will be shared with all the remaining participants and the accuracy and precision of sample data sets will be analyzed.


Time Topic Facilitator
1:00-1:05 Welcome and Introduction
1:05-1:45 General aspects and applications of crash reconstruction methodologies for bicycle crashes Dietmar Otte
1:45-2:30 Limitations of reconstruction of bicycle crashes and possibilities with software packages Dietmar Otte
2:30-3:00 Overview of interactive exercise Rajeev Kelkar
3:00-3:15 Coffee break (Kemper Hall south patio)
3:15-4:05 Interactive data gathering of GPS and other data by participants Rajeev Kelkar
4:05-5:00 Interactive analysis and reconstruction using data by participants Rajeev Kelkar