The authors analyzed Strategic Highway Research Program 2 (SHRP2) naturalistic driving study data to better understand correlations between driver behaviors relevant to safety and freeway guide signs at interchange areas. Agencies develop sign complexity thresholds for freeway interchange areas to ensure driver safety and make associated recommendations for practitioners. Based on observations that sign complexity affects drivers unfamiliar with an interchange much more than it does familiar drivers, the research study identified considerations for guide sign design. The research may be of interest to roadway designers, safety professionals, and others with an interest in the mitigation of disruptions to vehicle flow through complex freeway interchanges.

Recommended citation: Federal Highway Administration, Freeway Guide Sign Performance at Complex Interchanges: Reducing Information Overload (Washington, DC: 2024) https://doi.org/10.21949/1521740