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Safety effects of reducing the speed limit from 90 km/h to 70 km/h

机译：将速度限制从90 km / h降低到70 km / h的安全影响

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摘要

Speed is one of the main risk factors in traffic safety, as it increases both the chances and the severity of a crash. In order to achieve improved traffic safety by influencing the speed of travel, road authorities may decide to lower the legally imposed speed limits. In 2001 the Flemish government decided to lower speed limits from 90 km/h to 70 km/h on a considerable number of highways. The present study examines the effectiveness of this measure using a comparison group before- and after study to account for general trend effects in road safety. Sixty-one road sections with a total length of 116 km were included. The speed limits for those locations were restricted in 2001 and 2002. The comparison group consisted of 19 road sections with a total length of 53 km and an unchanged speed limit of 90 km/h throughout the research period. Taking trend into account, the analyses showed a 5% decrease [0.88; 1.03] in the crash rates after the speed limit restriction. A greater effect was identified in the case of crashes involving serious injuries and fatalities, which showed a decrease of 33% [0.57; 0.79]. Separate analyses between crashes at intersections and at road sections showed a higher effectiveness at road sections. It can be concluded from this study that speed limit restrictions do have a favorable effect on traffic safety, especially on severe crashes. Future research should examine the cause for the difference in the effect between road sections and intersections that was identified, taking vehicle speeds into account.
机译：速度是交通安全的主要风险因素之一，因为它会增加发生事故的机会和严重程度。为了通过影响行驶速度来提高交通安全性，道路当局可以决定降低法律规定的速度限制。 2001年，佛兰芒政府决定在相当多的高速公路上将速度限制从90 km / h降低到70 km / h。本研究在研究之前和之后使用一个比较小组来检验该措施的有效性，以说明道路安全中的一般趋势影响。其中包括61个路段，总长度为116公里。这些位置的速度限制在2001年和2002年受到限制。在整个研究期间，比较组包括19个路段，总长度为53 km，未限制速度限制为90 km / h。考虑到趋势，分析显示下降了5％[0.88; [1.03]中的速度限制限制后的崩溃率。在涉及重伤和死亡的撞车事故中，发现了更大的影响，下降了33％[0.57; 0.79]。对交叉路口和路段的撞车事故进行的单独分析显示，路段的撞车效率更高。从这项研究可以得出结论，限速限制确实对交通安全，特别是严重的撞车事故有有利影响。未来的研究应在考虑车速的情况下，检查确定的路段和交叉口之间的影响差异的原因。

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