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MnIDOT Access Management Manual 3.4.3 Spacing between Driveways Definitions The Spacing between Driveways is the spacing between adjacent driveways as measured from the near edges of each driveway(see Figure 3.25). The driveways may be on the same side of the highway or on opposing sides of the highway. Figure 3.25: Spacing between Adjacent Driveways Spacing between Adjacent Vffimmy Spacing between Adjacent D&eway Quidance and Examples The spacing between two driveways affects the safety and operations of a highway differently, depending on the design of the driveway and the volume of traffic using the driveway. * The spacing of high-volume(Type 3) driveways along a high-speed highway has the potential to affect the safety and operations of the highway. The potential impact occurs when vehicles queuing at one driveway block the sight distance at an adjacent driveway. This generally is a concern only at high-volume driveways where vehicle queuing may take place. At low-volume (Types 1 and 2)driveways, vehicle queuing is unlikely, and the likelihood of vehicles entering the highway from adjacent driveways at the same time is also small. Spacing between high- volume driveways is also important in order to reduce the potential for overlapping right-turn lanes, should two adjacent high-volume driveways require turn lanes. * The spacing of all types of rural design driveways(Types 1, 2, and 3) has the potential to affect the safety of the highway. The potential impact occurs when a vehicle runs off the road and hits the driveway side slope. To minimize the severity of the crash, all driveways should be designed in accordance with the Mn/DDT Road Design Manual. The spacing between the driveways is based on providing a clear landing area beyond a driveway for errant vehicles to safely land if they are launched over a driveway(see Figure 3.26). January 2, 2008 Page 30