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MnIDOT Access Management Manual <br /> Figure 3.26: Rural Driveway Spacing <br /> ry <br /> f 4r } �0 <br /> F <br /> Drtvmy Spadng <br /> 0 In rural areas (Subcategories AF and A), the spacing between low-volume(Types 1 and 2) <br /> driveways should provide a safe landing area for errant vehicles. Figure 3.27 lists the spacing <br /> needed to provide an adequate and safe landing area. The spacing is applicable for the <br /> following: <br /> o For two driveways serving the same parcel or adjacent parcels; and, <br /> o For two driveways on the same side of the highway. <br /> a In rural and urban/urbanizing areas (Subcategories AF, A and B), the spacing between high- <br /> volume (Type 3) driveways should provide adequate stopping sight distance for the posted <br /> speed of the highway, as shown in Figure 3.27. This spacing is applicable for the following: <br /> o For two driveways serving the same parcel or adjacent parcels; and, <br /> o For two driveways on the same side of a highway or on opposing sides of an <br /> undivided highway. <br /> ■ In urban core areas (Subcategory C), highway speeds are generally low and parcels are <br /> generally small. Using the Spacing between Adjacent Driveways as the basis for the spacing <br /> of adjacent driveways generally is not practical. <br /> Figure 3.27: §pacing between Adjacent Driveways <br /> Rural Rural & Urban/Urbanizing <br /> Posted Speed Limit (Types 1 &2) (Type 3) <br /> (mph) Spacing between Adjacent Spacing between Adjacent <br /> Driveways Driveways <br /> (feet) feet <br /> 40 -- 305 <br /> 45 50 _ _ 360 <br /> 50 75 _ 425 <br /> 55 100 _ 495 <br /> 60 100 570 <br /> 65 -- 645 <br /> S acmi between Adjacent High-Volume Drivewa s is based on the Stopping Sight Distance described in the <br /> 7'.)'Thep g jy PP� 9 9 <br /> AASHTO Green Book 2001 and the WDOT Road Design Manual, Tabie 2-5.09A, but uses the posted speed of the <br /> highway instead of the design speed. <br /> (2) The values shown in this table may be superceded to avoid the functional area (see Section 3.4.4) of adjacent <br /> intersections and driveways,or to accommodate turn lanes for the proposed access. <br /> (3) The spacing between adjacent driveways is based on a level roadway without any horizontal curvature, In areas with <br /> vertical and horizontal curves,additional distance may be needed. <br /> (4) Spacing based on the Texas Transportation Institute"Safety of Driveways in Close Proximity to Each Other."The spacing <br /> was modeled for speeds between 45 mph and 60 mph. No data is available for posted speeds below 45 mph or above 60 <br /> mph. F; ' <br /> � 1 <br /> January 2, 2008 _ Page 31 <br /> 3 --- wove S 5 <br /> e, Z <br />