Improving Rural Intersection Safety and Efficiency with Dynamic Dilemma Zone Protection: Alabama Pilot Study
Alabama
Rural high-speed intersections in Alabama experienced several benefits, including 24-35% fewer red light-runner crashes, in a pilot of CWA (continuous wide area) sensors used in a dynamic DZP (dilemma zone protection) system.
Concerned with rural intersections crashes, MnDOT developed a standard layout of lane constrictors. They installed lane constrictors at 61 side street, stop-controlled locations.
MassDOT’s FoRRRwD initiative provided municipalities with low-cost safety countermeasures. As countermeasures were implemented, MassDOT noted reduced crashes and serious injuries from crashes.
GDOT incorporated visibility enhancements and friction improvements on rural curves after finding that lane departures represented a large proportion of fatalities on curves.
With 40% of fatalities and serious injuries occurring at low-volume, unsignalized intersections, DelDOT implemented All-Way Stop Control. After three years, there were zero fatalities and 82% fewer injury crashes at the intersections evaluated.
NJDOT noted a 10-16% reduction in total crashes due to implementations from road safety audits. Over 25 road safety audits RSAs have been conducted on state, county, and municipal roadways under HSIP.
