| Title | National Traffic Speeds Survey II: 2009 |
|---|---|
| Record ID | 45706 |
| Personal Name Creator |
Huey, R.; De Leonardis, Doreen; Freedman, M. |
| Corporate Creator | Westat, Inc. |
| Corporate Contributor |
United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research |
| Publisher | United States. National Highway Traffic Safety Administration |
| Publication Date | 20120700 |
| Language | English |
| Abstract | 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. Overall, speeds of free-flow traffic on freeways averaged 70.5 mph and were approximately 17 mph higher than on major arterials, which at 53.3 mph were in turn about 6 mph higher than the mean speed of 47.0 mph on minor arterials and collector roads. Most traffic exceeded the speed limits. Seventy-one percent of traffic on limited access roads and about 56% of traffic on arterials and collectors exceeded the speed limit. About 16% of traffic exceeded the speed limit by 10 mph or more on freeways, arterials, and collector roads. Speeds of passenger vehicle size classes were generally higher than for medium trucks. |
| Rosap ID | dot:1914 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/1914 |
| TRT Terms | Traffic speed; Speed and delay studies; Speed data; Traffic speed measurement; Traffic safety; Highway safety |
| General Subjects | Speed-related crashes; Speed management; Driving speeds; Traffic safety; Speed measurement |
| Classification | NTL - OPERATIONS AND TRAFFIC CONTROLS - OPERATIONS AND TRAFFIC CONTROLS; NTL - PLANNING AND POLICY - Surveys; NTL - SAFETY AND SECURITY - Speed Limits; NTL - SAFETY AND SECURITY - Highway Safety; NTL - SAFETY AND SECURITY - Accidents |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1447855 |
| Contract Number | DTNH22-06-D-00033; Task order 0001 |
| Report Number | DOT HS 811 638 |
| Availability | NHTSA - Behavioral Safety Research |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/45000/45700/45706/811638.pdf |
| Format | |
| Database | NTL Digital Repository |