Distracted driving is a leading cause of traffic accidents. It is influenced by driver attitude toward secondary tasks; however, field-based studies on the effects of low-perceived-risk tasks on lateral driving have rarely been reported. A total of 17 experienced non-professional drivers were recruited to participate in two secondary tasks: a cognitive experiment (conversation) and a visual distraction experiment (observation of following vehicles), each representing low-perceived-risk secondary tasks. One-way analysis of variance (ANOVA) was conducted to evaluate the effects of low-perceived-risk tasks on lateral driving performance. ANOVA results indicated that compared with baseline (no task) lateral performance, lane-keeping ability was enhanced during cognitive distractions. In the visual distraction experiment, more than 50% of the distractions required 1–2 s. Lane deviation and its growth rate increased with the duration of distraction. Compared with cognitive distraction, lane deviation increased significantly with visual distraction, and lane-keeping performance was seriously impaired. For low-perceived-risk tasks, visual distractions impaired driving safety more seriously, compared with cognitive distractions, suggesting that drivers misjudge the risks associated with visual tasks. These results can contribute to the design of advanced driving-assistance systems and improve professional driver programs, potentially reducing the frequency of traffic accidents caused by distracted driving.

分心驾驶是交通事故的主要原因。它受驾驶员对次要任务态度的影响；然而，关于低感知风险任务对侧向驾驶的影响的基于实地的研究很少被报道。总共招募了17名经验丰富的非专业驾驶员参加两项次要任务：一项认知实验（对话）和一项视力分散实验（观察后续车辆），每项都代表低感知风险的次要任务。进行了单向方差分析（ANOVA），以评估低风险任务对侧向驾驶性能的影响。方差分析的结果表明，与基线（无任务）的横向表现相比，认知分散期间的车道保持能力得到了增强。在视觉分散实验中 超过50％的注意力分散需要1-2秒。车道偏差及其增长率随着干扰时间的延长而增加。与认知分心相比，车道偏离随着视觉分心而显着增加，并且行车保持性能严重受损。对于低感知风险的任务，相比于认知分心，视觉干扰更严重地损害了驾驶安全，这表明驾驶员误判了视觉任务带来的风险。这些结果可有助于高级驾驶辅助系统的设计并改善专业驾驶员程序，从而有可能减少因分心驾驶而导致交通事故的频率。视线转移会导致车道偏离明显增加，并且严重影响车道保持性能。对于低感知风险的任务，视觉分心比认知分心更严重地损害了驾驶安全，这表明驾驶员误判了与视觉任务相关的风险。这些结果可有助于高级驾驶辅助系统的设计并改善专业驾驶员程序，从而有可能减少因分心驾驶而导致交通事故的频率。视线转移会导致车道偏离明显增加，并且严重影响车道保持性能。对于低感知风险的任务，相比于认知分心，视觉干扰更严重地损害了驾驶安全，这表明驾驶员误判了视觉任务带来的风险。这些结果可有助于高级驾驶辅助系统的设计并改善专业驾驶员程序，从而有可能减少因分心驾驶而导致交通事故的频率。