Bridge strike reduction: optimising the design of markings

Area of Science:

• Road safety engineering
• Human factors in transportation
• Traffic management systems

Background:

• High-sided vehicles striking low bridges pose a significant safety hazard globally, particularly in the UK.
• Current bridge marking standards may not adequately convey overhead clearance risks to drivers.
• Reducing bridge strikes is crucial for infrastructure protection and public safety.

Purpose of the Study:

• To evaluate the effectiveness of a novel low bridge marking design in enhancing driver caution.
• To compare driver decision-making with experimental markings versus standard UK markings.
• To assess the impact of marking design and approach distance on safe navigation judgments.

Main Methods:

• An experiment was conducted using a full-scale, adjustable-height bridge mock-up.
• Participants were positioned in a truck cab, driving towards the bridge.
• Subjects judged the safety of passing under the bridge, with varying marking types and approach distances.

Main Results:

• The experimental bridge marking significantly increased driver caution compared to the standard UK marking.
• This effect was observed consistently across two different bridge heights.
• Decision caution increased as drivers approached the bridge, regardless of marking type.

Conclusions:

• The novel bridge marking design demonstrates potential for reducing bridge strikes by promoting more cautious driver behavior.
• Approach distance is a critical factor influencing navigation decisions, with closer proximity leading to increased caution.
• Implementing improved bridge markings can enhance road safety and mitigate infrastructure damage from vehicle collisions.