2024-06-02-亚开行-CAREC道路安全工程手册6_识别_调查和处理黑社会（英）_90页_3mb

Purpose of the CAREC Road Safety Engineering Manual 6

This manual provides guidance for identifying, investigating, and treating blackspots (high-frequency crash locations) in Central Asia Regional Economic Cooperation (CAREC) countries. It targets road safety engineers, planners, municipal engineers, traffic police, and other stakeholders to reduce crashes, save lives, and achieve cost-effective safety improvements, aligning with the Safe System approach.

Blackspot Definition and Process Overview

• Blackspot: A location with a high number of casualty crashes.
• Process: Involves three stages:
  1. Identification: Using crash data to prioritize high-risk sites.
  2. Investigation: Analyzing crash patterns, conducting site inspections, and proposing treatments.
  3. Treatment: Implementing cost-effective countermeasures (e.g., roundabouts, delineation, speed management).

Safe System Approach

The Safe System prioritizes eliminating fatal and serious injuries by designing roads to accommodate human error. Key principles include reducing crash likelihood, managing speeds, and mitigating crash severity. Treatments must comply with this approach to maximize safety benefits.

Economic Consideration and Prioritizing

• Benefit-Cost Ratio (BCR): Calculates the ratio of crash savings to treatment costs; projects with BCR > 1.0 are prioritized.
• Budget allocation ensures funds are used for high-return blackspots, often yielding up to $4 in crash savings for every $1 spent.

Case Studies

Real-world examples demonstrate proven treatments:

• Urban intersections: Roundabouts and lighting reduced crashes significantly.
• Rural highways: Run-off-road countermeasures (e.g., barriers, widened shoulders) improved safety.
• Mass action programs: Low-cost treatments on high-crash routes yielded substantial reductions.

Conclusion

The manual emphasizes that eliminating blackspots is a cost-effective investment in road safety, requiring collaboration between road authorities and traffic police. By following this process, CAREC countries can achieve sustainable reductions in road trauma and enhance economic benefits.