Motorcycle and scooter speeds approaching urban intersections

Area of Science:

• Traffic Safety
• Motorcycle Dynamics
• Urban Planning

Background:

• Motorcycle crashes are a significant public health concern, particularly at urban T-intersections.
• Previous research suggests driver inattention ('looked-but-failed-to-see') contributes to motorcycle-vehicle collisions.

Purpose of the Study:

• To quantify motorcycle and scooter speeds in urban traffic compared to cars.
• To identify factors influencing motorcycle speed behavior at high-risk intersections.
• To inform strategies for reducing motorcycle crashes through improved conspicuity.

Main Methods:

• Instrumentation and roadside observers monitored five urban T-intersections.
• Data collected included vehicle speeds, types, lane positions, and motorcycle behaviors.
• Observations captured over 100,000 vehicle events across 12-hour periods per site.

Main Results:

• Motorcycles traveled approximately 10% faster than cars (mean difference of 3.3 km/h).
• Motorcycles were 3.4 times more likely to exceed speed limits than cars.
• Scooter speeds and speeding behaviors mirrored those of motorcycles.

Conclusions:

• Motorcycles exhibit significantly higher speeds than other vehicles in urban environments.
• Speeding and conspicuity are critical factors in motorcycle safety at intersections.
• Findings support interventions aimed at enhancing motorcycle visibility and addressing driver perception.