Related Experiment Video
Updated: Aug 7, 2026

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
Published on: January 20, 2023
An analysis of public posting in reducing speeding behavior on an urban highway
1Mount Saint Vincent University.
Abstract:
The effects of public posting on speeding behavior on an urban highway were assessed using a reversal design. During baseline the percentage of drivers speeding was measured with a concealed radar unit. During the daily posting condition a highway sign was installed which provided feedback on the percentage of drivers not speeding yesterday and the best record to date. This sign was then covered and reintroduced. Results indicated that the sign was effective in reducing speeding behavior. Furthermore, the effects were most pronounced in reducing the speeds of the faster drivers. Next, daily and weekly postings were compared with the sign alone without numerical feedback: results revealed that the weekly posting condition was as effective as the daily posting condition, but that the sign had no influence when numbers were not posted. Finally, the weekly posting procedure remained effective during a 6-month follow-up condition.
Related Concept Videos
Social Traps
Manipulation and Analysis
Design Example: Alignment of a Road Line Using GIS
Archival Research
Introduction to Limits
The Anchoring-and-Adjustment Heuristic
