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Impact of Speed Limits and Road Characteristics on Free-Flow Speed in Urban Areas
| 题名： | Impact of Speed Limits and Road Characteristics on Free-Flow Speed in Urban Areas |
| 正文语种： | 英文 |
| 作者： | Royal Institute of Technology |
| 作者单位： | Ary P.Silvano and Karl L.Bang |
| 关键词： | Posted speed limit; Urban roads; Free-flow speed; Road characteristics and traffic safety |
| 摘要： | The paper documents studies of posted speed limit (PSL) changes on the free-flow speed on urban roads. Before and after field measurements were conducted, changing the existing PSL from 50 to 40 or 60 km/h. The analysis was conducted on the mean free-flow speed difference and speed variability. The data collected were also used for multiple regression analysis, including PSL changes and selected self-explaining road characteristics. The results showed that a decreased PSL caused a small (1.6 km/h) but significant reduction in the mean free-flow speed and speed variance, which might lead to a 10% reduction of severe injury accidents. Furthermore, the PSL reduction had a larger impact on faster drivers and higher road network classes. Conversely, an increased PSL resulted in a 2.6 km/h increase in the mean free-flow speed but no change on speed variability. The regression results indicated that the free-flow speed was heavily influenced by road characteristics, such as carriageway width, road environments, and the presence of on-street parking and sidewalks. Arterial roads presented the largest impact. The PSL had a relatively small impact. |
| 出版年： | 2016 |
| 期刊名称： | Journal of Transportation Engineering |
| 卷： | Vol.142 |
| 期： | No.2 |
| 页码： | 04015039 |
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