Traffic Safety Department, Transportation Research Institute (IMOB), Hasselt University, Diepenbeek, Belgium.
Hum Factors. 2011 Dec;53(6):771-85. doi: 10.1177/0018720811419848.
It was investigated how speed limit repetition and distraction affect drivers' speed management throughout a road section where the imposed speed limit is not in accordance (too low) with road design.
It is not clear how driving speed evolves and to what degree speed limit repetition is necessary on roads where the imposed speed limit is not in accordance (too low) with road design. It is furthermore of interest how all these factors are influenced by driver distraction.
In a driving simulator, 47 volunteers completed one trip with and without distraction. Within each trip, three configurations were presented: speed limit sign repetition after every intersection, repetition only in the middle of a segment, or no repetition.
Distraction lowered driving speed. Speed management varied depending on speed limit repetition. The speed limit was exceeded more often when speed limit signs were repeated less frequently. When drivers were not reminded of the limit, speed linearly increased throughout the segment. In all three configurations, speed increased toward the end of the segment, but this increase was largest when there had been no repetition at all of the speed limit.
In low-demanding road designs that allow drivers to exceed the speed limit, limit repetition is necessary. Frequent repetition may be preferred, as speed management was most homogenous in that case.
The proposed analysis of speed management throughout a section increases our understanding of how speed evolves and thereby shows where repetition of the speed limit is necessary.
研究在限速与道路设计不符（过低）的路段，限速重复和分神如何影响驾驶员的速度管理。
在限速与道路设计不符（过低）的道路上，行驶速度如何变化，限速重复到什么程度是必要的，这些问题尚不清楚。此外，这些因素如何受到驾驶员分神的影响也很有趣。
在驾驶模拟器中，47 名志愿者在有分心和无分心两种情况下完成了一次行程。在每次行程中，呈现了三种配置：在每个交叉口后重复限速标志、仅在路段中间重复、或不重复。
分神降低了驾驶速度。限速重复会影响速度管理。限速标志重复频率越低，限速被超过的次数就越多。当驾驶员没有被提醒限速时，速度在整个路段线性增加。在所有三种配置中，速度在路段末端增加，但在完全没有限速重复的情况下，增加幅度最大。
在允许驾驶员超速的低要求道路设计中，限速重复是必要的。频繁重复可能更受欢迎，因为在这种情况下，速度管理最为一致。
对路段限速管理的分析增加了我们对速度变化的理解，从而显示出需要重复限速的地方。
