Evaluation of alternative intersection treatments at rural crossroads using simulation software.

Area of Science:

• Road Safety Engineering
• Traffic Accident Analysis
• Simulation Modeling

Background:

• Rural roads present unique hazards like poor geometry and high speeds, leading to disproportionately high traffic fatalities and serious injuries, especially at intersections.
• In the US, rural areas experience twice the traffic fatalities of urban areas despite lower vehicle miles traveled and population.
• Intersection design and speed are critical factors in rural road safety.

Purpose of the Study:

• To assess the safety benefits of four alternative intersection treatments for rural roads.
• To evaluate the effectiveness of countermeasures in mitigating crash severity using in-depth crash data and advanced reconstruction.
• To identify optimal safety strategies for high-risk rural intersections.

Main Methods:

• Reconstruction of a real-world serious injury rural crash involving a passenger vehicle and a truck using specialized software.
• Development of four hypothetical intersection treatments in CAD software: roundabout, rumble strips, reduced speed limit, and a combination of reduced speed limit and rumble strips.
• Analysis of crash forces and potential injury severity reduction for each treatment scenario.

Main Results:

• Hypothetical scenarios showed significant reductions in impact force and altered impact points, leading to lower injury severity.
• The most favorable outcome involved reducing the main approach speed limit to 80 km/h and adding rumble strips to both approaches, potentially avoiding the crash entirely.
• This combination treatment demonstrated substantial improvements in mitigating crash severity.

Conclusions:

• Speed is a crucial factor in crash severity, and effective countermeasures can significantly reduce road trauma on rural roads.
• Validated simulation software offers a cost-effective method for evaluating alternative intersection treatments.
• Implementing tested countermeasures at rural intersections can yield significant safety benefits and reduce fatalities and serious injuries.