Fixed barriers design
Fixed barriers, like guardrails and concrete barriers, are designed to redirect vehicles and prevent them from leaving the roadway. While essential for overall road safety, traditional fixed barrier designs can pose a significant hazard to motorcyclists. Improved designs aim to mitigate these risks.
Detailed explanation
Traditional fixed barriers, while effective for cars, often present a blunt, rigid surface that can cause severe injuries to motorcyclists upon impact. The impact can cause the rider to be thrown from the motorcycle, collide with the barrier or other objects, or even be trapped between the motorcycle and the barrier. Improved fixed barrier designs focus on minimizing these risks.
Types of Fixed Barrier Design Improvements
Closer post spacing can reduce the chances of a motorcyclist’s limbs or body passing through the barrier.
Minimizing or eliminating exposed bolts, sharp edges, and other protrusions can reduce the risk of snagging or secondary impacts.
In some applications, a lower rail height can be more effective for motorcycles, preventing riders from impacting the upper portion of the barrier.
Barriers designed to deform or absorb impact energy can reduce the severity of the impact for motorcyclists.
Specially designed end treatments can minimize the risk of a motorcyclist impacting the end of the barrier, which can be particularly hazardous.
how/when to apply
Improved fixed barrier designs should be considered in areas with high motorcycle traffic, on curves, along highways, and in other locations where the risk of motorcycle crashes is high. Analyzing crash data, particularly those involving motorcycle impacts with barriers, can help identify locations where these improvements are most needed.
Key Takeaways
Pros
- Reduced Impact Severity: Improved designs can reduce the severity of injuries to motorcyclists compared to traditional barriers.
- Improved Redirection: Can effectively redirect motorcycles, preventing them from leaving the roadway.
- Potential for Increased Safety: Offers a potential safety benefit for motorcyclists in areas with high crash risk.
Cons
- Cost: Implementing improved fixed barrier designs can be more expensive than traditional barriers.
- Limited Effectiveness: Even with improved designs, there is still a risk of injury to motorcyclists upon impact.
- Maintenance: Regular maintenance is essential to ensure the effectiveness of fixed barriers, particularly energy-absorbing designs.
- Aesthetic Concerns: Some improved barrier designs may be less aesthetically pleasing than traditional barriers.
Design manuals
Design Manual 1
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Design Manual 2
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Design Manual 3
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Resources
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