Speed behaviour in work zone crossovers. A driving simulator study.

Area of Science:

• Traffic Engineering
• Human Factors in Transportation
• Road Safety Research

Background:

• Reducing crash risk in work zones is critical.
• Speed and speed variability are key factors in work zone safety.
• Motorway crossover work zones present unique traffic challenges.

Purpose of the Study:

• To evaluate driver behavior in various motorway crossover work zone configurations.
• To compare driver speed and deceleration in response to different work zone designs.
• To assess the impact of variable message signs, channelizing devices, and perceptual treatments on driver behavior.

Main Methods:

• Utilized a driving simulator to test nine distinct work zone configurations.
• Collected speed and deceleration data from 42 participants.
• Compared driver responses to a standard Italian design with eight alternative configurations.

Main Results:

• Drivers consistently exceeded posted temporary speed limits across all configurations.
• Significant speed reductions were observed primarily within bypass areas.
• Higher speed limits, wider median openings, and taller channelizing devices increased speed homogeneity.
• Perceptual measures resulted in the greatest speed homogenization and mean speed reductions.

Conclusions:

• Standard work zone designs often fail to adequately reduce driver speeds.
• Optimized work zone configurations, incorporating perceptual elements, can significantly improve traffic flow homogeneity and reduce speeds.
• Human factor-based perceptual treatments are highly effective in enhancing work zone safety.