Statistical Analysis of Travel Speed Reduction Factors Considering Pavement Distresses Including Pothole Repair Patches

Key Points

• The aim is to assess how pavement distresses, particularly from pothole repairs, affect vehicle travel speeds on highways.
• Analyzed 200km of national highways in Hokkaido using vehicle-mounted cameras and traffic probe data.
• Measured pavement conditions including crack rate, International Roughness Index (IRI), and rut depth.
• Applied statistical models to determine the influence of pavement distresses on vehicle speeds.
• Found that approximately 50% of the targeted roads have significant pothole repair areas affecting pavement quality.
• Increased IRI significantly contributes to speed reduction for both general and logistics vehicles.
• Repairing sections with over 10 pothole areas can potentially reduce travel time by more than 4%.