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By Hugh W McGee; National Research Council (U.S.). Transportation Research Board.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration
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Additional info for Geometric design practices for resurfacing, restoration, and rehabilitation
Speed-Related Criteria. , vertical curves, horizontal degree of curvature). The 3R design speed is used to determine these speed-related criteria. For many speed-related elements, Chapter 11 presents an acceptable threshold value for the element which is considerably below the 3R design speed. For example, if the calculated design speed of an existing crest vertical curve is within 15 mph of the 3R project design speed and there is not an adverse accident history, the existing crest vertical curve may be retained in the project design without a design exception.
MI = Minor design improvements other than reconstruction. R = Reconstruct vertical curve to current UDOT standards based on cost/benefit analysis. * High-accident locations must be analyzed for reconstruction to current UDOT standards. TABLE 17 STOPPING SIGHT DISTANCE REQUIRED FOR 3R PROJECTS IN FLORIDA Design Speed (mph) Stopping Sight Distance (ft) 15 80 20 115 25 155 30 200 35 250 40 305 45 360 50 425 55 495 60 570 65 645 Cross Slope Typically, the pavement surface is sloped slightly to facilitate water drainage.
Horizontal clearance is defined as the lateral distance (offset) from the edge of the travel lane to a roadside feature or object, such as curbs, walls, barriers, bridge piers, sign and signal supports, trees, and utility poles. This is not the same as clear zone. Clear zone is a clear recovery area, free of rigid obstacles and steep slopes, that allows vehicles that have run off the road to safely recover or come to a stop. While horizontal clearance can be thought 29 of as an operational offset, the clear zone primarily serves a substantive safety function.
Geometric design practices for resurfacing, restoration, and rehabilitation by Hugh W McGee; National Research Council (U.S.). Transportation Research Board.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration