Impact of Crash Fact Signs on Driver Speeding Behavior: Evidence from the Sahrawi Highway

Emerging technologies with the potential to reduce vehicle speeds and enhance road safety have attracted increasing research interest. To address speeding behavior on the Jordanian Sahrawi Highway, this study employs a driving simulation experiment to evaluate potential countermeasures. A Dynamic Warning Crash Fact Sign (DWCFS) is proposed, and its effectiveness is assessed under various driving scenarios. The simulation replicates a high-speed section of the Sahrawi Highway, integrating DWCFS messages designed to influence driver behavior. Sixty participants will complete multiple experimental scenarios, divided into four data collection areas. Two scenarios feature dynamic messages: (1) “10 INJURIES OVER 2 YEARS – SLOW DOWN, SPEED KILLS,” and (2) “OVER 10 PEOPLE WERE KILLED LAST YEAR ON THIS ROAD.” Signs will be placed at different points, including the entrance to a residential area with an 80 km/h speed limit and on an uninterrupted section with a 110 km/h limit. Key performance measures—such as speed, lane position, acceleration, deceleration, and headway—will be compared to assess compliance and behavioral changes. It is anticipated that the DWCFS will lead to reductions in average speed, 85th percentile speed, and the proportion of vehicles exceeding the posted speed limits on the Sahrawi Highway.