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For a person on a bicycle at intersections, trail crossings, or midblock locations that are signalized, knowing that they have been detected and how long they must wait to receive a green indication is valuable information. This presentation will summarize the findings from the online survey (1,048 responses), observed behaviors (2,428 persons on bicycle), and an intercept survey ( 234 persons) to understand blue light feedback devices and countdown timers at signalized intersections.

Findings suggest that the design where the blue light was embedded in the sign was more visible to cyclists and observed by higher proportions of cyclists in the field. Results show that a bicycle signal countdown timer elicited high comprehension rates. At all locations, cyclists indicated that the devices improved their waiting experience.

Biographical Information

Dr. Christopher M. Monsere is Professor of Civil and Environmental Engineering and Associate Dean for Academic Affairs in the Maseeh College of Engineering & Computer Science at Portland State University. Dr. Monsere's primary research interests are in design and operation of multimodal transportation facilities including user behavior, comprehension, preferences, and the overall safety effectiveness of transportation improvements. Dr Monsere is a member of ANF20, the Bicycle Transportation Committee, the past co-chair of the Transportation Research Board's Safety Data, Analysis, and Evaluation committee (ANB20) and a past member of the TRB Task Force to develop the Highway Safety Manual (ANB25T).

Sirisha Kothuri, Ph.D. is a senior research associate in the Department of Civil and Environmental Engineering at Portland State University. Dr. Kothuri’s primary research interests are in the areas of multimodal traffic operations, bicycle and pedestrian counting, and safety. Dr. Kothuri is the research co-chair of the Transportation Research Board’s Pedestrians Committee (ANF10) and the Bicycle and Pedestrian Data Subcommittee (ABJ 35(3)) and a member of Traffic Signal Systems committee. Dr. Kothuri received her BCE from Osmania University, India, MSCE from Louisiana State University, Baton Rouge and Ph.D. from Portland State University.

Dr. David S. Hurwitz is a Professor of transportation engineering and Director of the Driving and Bicycling Research Laboratory in the School of Civil and Construction Engineering at Oregon State University (OSU). David also serves as the Associate Director at OSU for the Pacific Northwest Transportation Consortium (PacTrans). David conducts research in the areas of transportation human factors, traffic control, transportation safety, driving & bicycling simulation, and engineering education. In particular Dr. Hurwitz is interested in the consideration of user behavior in the design and innovation of transportation systems.


Signalized intersections -- Research -- Oregon -- Portland, Traffic flow -- Research -- Oregon -- Portland


Transportation | Urban Studies and Planning

Persistent Identifier

An Assessment of Bicycle Detection Confirmation and Countdown Devices



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