| Popis: |
The abnormally high mortality rate of Powered Two-Wheelers (PTW) is probably related to their vulnerability, but also to their behavior and interactions with other road users. There is a need to collect exposure data on PTWs to better understand uses and determinants involved in the mechanisms of accidents since there are almost no naturalistic studies on motorcyclists as on motorists. This paper aims to characterize the actual use dynamic capabilities of PTWs by motorcyclists through objective measures. In 2016-2018, an experiment was carried out to acquire Naturalistic Riding Data from 26 private motorcycles implemented with an Event Data Recorder. For 18 months, in three regions of France, the devices collected aggregated data on each ride thanks to accelerometers and gyrometers, and continuous speeds and trajectories, thanks to GPS. This paper presents the global distributions of accelerations, rotation rates and speed, and the extreme values reached at least once. It also illustrates the variability of behaviors: smooth driving versus sporty driving. 6500 travels were exploited, representing 88000 km. The motorcyclists endure rarely high levels of dynamic demands; especially in acceleration and deceleration, they exceed +-4 m/s² only 0.5% of the time. As far as cornering is concerned, their roll rate exceeds 20°/s only 0.8% and their yaw rate 2.1% of the time. Excluding time spent at standstill or at very low speed (less than 5 km/h), motorcyclists spend 80% of their time below 90 km/h and 3.2% of the time above 130 km/h, with 0.3% of the time above 150 km/h. The behavior varies greatly from one motorcyclist to another, even on the same itineraries. These data characterize the dynamics of motorcycles and discriminate different behaviors of riders. |
