Guide for the Geometric Design of Driveways (2010) / Chapter Skim
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Pages 7-17
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From page 7... ...
"Standard" driveways are grouped by intensity of use -- very high, higher, medium, and lower. "Special situation" driveways include those that create special needs (e.g., a driveway in a city center or serving a farm or ranch, a field, or an industry)
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8 Guide for the Geometric Design of Driveways Area Type Descriptive Attributes Relative Importance of Mode (as determined by the actual choices the public is observed to make) Auto Bicycle Ped Transit Urban Core (CBD and other major urban centers)
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SPECIAL SITUATION DRIVEWAYS Central business district Building faces are close to the street. May have onstreet parking or bus stops, a continuous sidewalk from the curb to faces of buildings, and higher pedestrian usage than in most other environments.
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Attributes that affect driveway design include vehicle width, vehicle length, vehicle height, vehicle turning radius, vehicle off tracking, and vehicle ground clearance dimensions. 10 Guide for the Geometric Design of Driveways
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, the guidelines deal with road and street intersections as opposed to driveway-roadway intersections. Design Vehicle Dimensions Widths and turning paths of design vehicles can be found in the latest edition of the AASHTO design policy.
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Vehicle ground clearance dimensions. Design Vehicle Rear Overhang (ft)
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Exhibit 3-7 lists suggested design vehicles for various types of driveways. Exhibit 3-8 shows an example from a state transportation agency.
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Category Description of Common Applications Design Vehicles STANDARD DRIVEWAYS Very high intensity Urban activity center, with almost constant driveway use during hours of operation. Large truck, buses (May be P-vehicle if have separate truck entrances.)
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Exhibit 3-10 shows findings from an older study. In 2007 and 2008, the speeds of over 1500 vehicles entering 12 driveways were measured near the roadway-driveway intersection and in the driveway throat (see Exhibit 3-11)
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(mph) Commercial 13 ft 13.0-19.5 2Rt 15.5 to 18.0 na Commercial 13 ft 13.0-19.5 2Lt na 10.0 to 13.0 Commercial 13 ft 13.0-19.5 4 7.0 to 10.4 7.8 to 13.9 LOCATION NOTES -- Speeds measured at: 2Rt-right turn, 25 ft before the near perpendicular edge of the driveway 2Lt-left turn, one lane width in advance of the driveway threshold (curb line)
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W "Development of Design Vehicles for the Hang-Up Problem." Transportation Research Record 1847, Transportation Research Board, National Research Council, Washington, DC (2003)
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