中文摘要：

驾驶人警觉性缺失是导致交通事故的重要原因，尤其是在单调环境下。在高速公路上，由于驾驶任务简单，环境单调，道路可预测性高，驾驶人的警觉性容易涣散。为研究单调环境下驾驶人的警觉性时变规律，利用仿真软件构建驾驶环境，共有10名驾驶人参与了驾驶模拟器试验。利用主观疲劳量表测量驾驶人驾驶前后的主观疲劳状态，运用MPl50采集驾驶人的心电数据，驾驶人在驾驶时需发现某种特定信号并报告。结果发现，在单调环境下，驾驶人在驾驶任务开始后30min，其信号的漏报率在不断增加，从8％增加到32％．驾驶人的心率在驾驶过程中并无显著性差异，但其主观疲劳程度有显著增加。上述结果表明，在单调环境下驾驶1h，驾驶人未发生生理疲劳，但其警戒性发生了变化，30min后警觉性开始下降。也说明了单调环境会导致驾驶人警觉性下降。

英文摘要：

Lack of vigilance is an important cause in traffic accident, especially in monotonous environment. Highway design reduces the driving task mainly to a lane-keeping manoeuvre. Such a task is monotonous, and the road is highly predictable, providing little stimulation. Under this environment, the drivers＇ vigilance may easily decrease. In order to study the varia- tion of drivers＇ vigilance with time under the monotonous environment, a simulator test was carried out. In this test, simula- tion software was used to build the driving environment, in which ten drivers participated voluntarily. Subjective fatigue state was measured by using the subjective fatigue scale ,and the MP150 was used to collect the Electrocardiograph （ECG） data of the drivers. Besides, the divers also need to found specific signals and report it. The result shows that drivers＇ miss rate of signal has changed under the monotonous environment. In the final 30 min, the drivers＇ miss rate of signal increased from 8% to 32%. The drivers＇ heart rate has no significant difference during the driving. However, the subjective fatigue level has significant difference. It is concluded that within one-hour driving under the monotonous environment, there is no fatigue on physical,but drivers＇ vigilance decreased in 30 rain after the driving. It is also proved that drivers＇ vigilance decreased under the monotonous environment.