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National Traffic Speeds Survey II: 2009. Traffic Tech, Technology Transfer Series. August 2012.
| 题名： | National Traffic Speeds Survey II: 2009. Traffic Tech, Technology Transfer Series. August 2012. |
| 关键词： | technology；national；traffic；series；speed；rans；measurement；geographic；spring；horizon |
| 摘要： | A field survey was conducted during spring and summer 2009 as a longitudinal repetition to a similar effort undertaken in 2007. The goal was to measure travel speeds and prepare nationally representative speed estimates for all types of motor vehicles on freeways, arterial highways, and collector roads across the United States. Over 10 million vehicle speeds were measured at 627 sites included in the geographic cluster sample of 20 primary sampling units (PSUs). Each PSU was a city, county, or group of two or three counties representing combinations of regions of the United States, level of urbanization, and type of topography (flat, hilly, mountainous). Speeds were acquired on randomly drawn road segments on limited access highways, major and minor arterial roads, and collector roads. Speed measurement sites were selected in road segments with low, medium, or high degrees of horizontal and vertical curvature or gradient. |
| 报告类型： | 科技报告 |
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