Agenda - Council - 08/08/2016 - Laserfiche WebLink

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33 LOCAL STATE-AID ROUTE STANDARDS,FINANCING 8820.9926 environmental impacts,terrain limitations,bicycle traffic,pedestrian traffic,other nonmo- torized uses,functional classification,or other factors. Widths less than those indicated in the chart require a variance in accordance with parts 8820.3300 and 8820.3400. (a)For existing ADT greater than 400,part 8820.9920 standards apply. (b)Applies to slope within the clear zone only. (c) Culverts with less than 30-inch vertical height allowed without protection in the clear zone. (d) Subject to terrain. (e)For roadways in suburban areas,the clear zone may be reduced to a width of ten feet for projected ADT under 1,000 and to 20 feet for projected ADT of 1,000 or over. Wherever the legal posted speed limit is 40 miles per hour or less,the clear zone may be reduced to a width of ten feet. HS 25 loading with AASHTO Standard Specifications or HL-93 loading with load and resistance factor design(LRFD) is required for new or reconstructed bridges. HS 18 loading is required for all rehabilitated bridges. The curb-to-curb minimum width for new or reconstructed bridges must be equal to the proposed lane plus shoulder widths,but in no case less than the minimum lane width plus four feet,and in no case less than required per Minnesota Statutes, section 165.04. Bridge structures of minimum 20-foot clear width may be constructed where existing ADT is less than 50,potential for increasing ADT is low, and the local government agency finds that the bridge width can operate effectively at that width for the expected life of the bridge. Statutory Authority: MS s 14.389; 162.02; 162.09 History: 29 SR 449; 36 SR 925 8820.9926 MINIMUM DESIGN STANDARDS: RURAL AND SUBURBAN UNDIVIDED; RECONDITIONING PROJECTS. Subpart 1. Minimum reconditioning standards. Reconditioning projects for rural or suburban undivided roadways must meet or exceed the minimum dimensions indicated in the following design chart. See part 8820.0200,subpart 30,for the description of activities allowed. Existing ADT Statutory or Lane Width(Paved) Combined Lane Regulatory Posted (Paved)and Shoulder Speed Width 1-749 Under 50 mph 10 feet 11 feet 1-749 50 mph or over 10 feet 12 feet 750 and over Under 50 mph 10 feet 12 feet 750 and over 50 mph&over 11 feet 14 feet When the road authority has determined that the roadway will be specifically designed to include on-road bicycle facilities, and only if the roadway surface is paved,the appro- priate design criteria in the current MnDOT Bikeway Facility Design Manual are recom- mended for design purposes. Engineering judgment should be used to choose a lane-width, on-road bicycle facil- ity, or shoulder width dimension other than the widths indicated in the chart. Factors to consider include safety, speed,population/land use,benefit/cost analysis,traffic mix,peak hourly traffic,farm equipment, environmental impacts, terrain limitations, bicycle traffic,