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Figure •p acr+ between Adjacent Driveways <br />..........,....... n w... <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) (2") (feet) t'n2i'r <br />40 305 <br />45 50 360 <br />50---------_._... 75 - 425 <br />55 100 495 <br />60 100 570 <br />65 645 <br />The Spacing between Adjacent High -Volume Driveways is based on the Stopping Sight Distance described in the <br />AASHTO Green Book 2001 and the Mn/DOT Road Desion Manual, Table 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(2) The values shown in this table may be superceded to avoid the functional area (see Section 3.4.4) of adjacent 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 />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. <br />Mn/DOT Access Management Manual <br />Figure 3.26: Rural Driveway Spacing <br />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 />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 />(1) <br />(3) <br />re 1 - Field Access <br />January 2, 2008 j.4‘4 F0‘J „ \ Page 31 <br />2- <br />Iva 3- CPAAitti.eoc r KQ / s Z -u' S 5 <br />