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The article reports that a United States. Federal Highway Administration (FHWA) study links dynamic messages to a reduction in roadway departures on two-lane rural curves, which have high crash histories. Most of the departure crashes occur on rural two-lane roadways with a disproportionate number taking place on horizontal curves. The average crash rate at horizontal curves is three times that of other types of highway segments.

The article offers information on Self-enforcing roadways. Topics include a speed management concept that involves designing roadways that encourage drivers to select operating speeds consistent with the posted speed limit; according to National Cooperative Highway Research Program Report that a design process is desired that can produce roadway designs; and mentions approach to developing self-enforcing or self-explaining roadways, to set speed limits that are reasonable and consistent.