Introduction: Vehicular accidents at horizontal curves are over-represented compared to accidents that occur at tangent sections. Investigations have been conducted aimed at identifying the major causes that result in higher accident risk, both in terms of severity and rate, at curved road sections. Excessive or abrupt changes in speeding and improper vertical position are cited as major factors of lane departure, whereas other factors (either human or environmental) have also been documented. However, most research involves 4-wheel vehicles rather than other modes of transport that behave differently. More specifically, while motorcyclist fatalities occur more frequently than passenger vehicles, when accounting for vehicle distance traveled only a limited number of research studies address their behavior at curved road sections. Method: This paper presents the findings of field operational tests carried out by motorcyclists along two-lane rural roads with a wide range of horizontal curves using an instrumented motorcycle. Key objectives of the research included the conditions under which the motorcyclists differentiate their trajectory in regards to the direction of the horizontal curves, the correlation between the trajectory and the geometry of the road, and the impact of the lighting conditions on riders’ behavior. Results: The research showed that motorcyclists tend to ride closer to the centerline of the road, neglect the hazards associated with dim lighting conditions, and maintain constant speed in the left hand and the right-hand horizontal curves.

介绍：与发生在切线路段的事故相比，水平曲线处的车辆事故比例过高。已经进行了调查，旨在确定导致弯曲路段事故风险（包括严重程度和发生率）更高的主要原因。超速的过度或突然变化和不正确的垂直位置被认为是车道偏离的主要因素，而其他因素（人为或环境）也被记录在案。然而，大多数研究涉及四轮车辆，而不是其他行为不同的交通方式。更具体地说，虽然摩托车手的死亡发生率高于乘用车，但在考虑车辆行驶距离时，只有有限数量的研究涉及他们在弯曲路段的行为。方法：本文介绍了摩托车手使用仪表摩托车在具有宽范围水平曲线的双车道乡村道路上进行的现场操作测试的结果。研究的主要目标包括摩托车手在水平曲线方向上区分其轨迹的条件、轨迹与道路几何形状之间的相关性，以及照明条件对骑手行为的影响。结果：研究表明，摩托车手倾向于靠近道路中心线骑行，忽略与昏暗照明条件相关的危险，并在左侧和右侧水平曲线上保持恒定速度。