Impact of the Rural Intersection Active Warning System (RIAWS) on driver speed: A driving simulator study.

•The Rural Intersection Activation Warning System (RIAWS) is designed to slow traffic.•It detects vehicles and activates electronic signage on the intersection approaches.•A simulator was used to examine the impact of signage type and content on speed.•The RIAWS 80 km/h sign resulted in significantly lower speeds than all other signs.