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The Manual on Uniform Traffic Control Devices (MUTCD) recommends a speed study, setting the posted speed limit to the nearest 5 mph mark of the 85th percentile
by mrbrownt 4y ago
The Manual on Uniform Traffic Control Devices (MUTCD) recommends a speed study, setting the posted speed limit to the nearest 5 mph mark of the 85th percentile of observed speed. Safety is not the primary design consideration when it comes to roads in the US.
- giantg2 4y agoThis is a half truth. It's one of many factors taken into consideration to set a safe speed limit. Speeds of motorists in normal conditions Traffic volume Roadway type (e.g., interstate, freeway, city street) Roadway features (e.g., curves, hills, number of lanes) Roadway setting (e.g., urban, rural, residential, woodland, farmland) Number and spacing of driveways or intersections Sight distances Presence of on-street parking Pedestrian or bicyclist activity Crash history Pavement condition