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

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8820.9920 LOCAL STATE-AID ROUTE STANDARDS,FINANCING 32 (e) Inventory rating of H 15 is required. A bridge narrower than these widths may remain in place if the bridge is not deficient structurally or hydraulically. (I) Shoulders are required to be a minimum width of eight feet for highways classified as minor arterials and principal arterials with greater than 1,500 ADT projected, at least two feet of which must be paved. If the roadway is designated as a bicycle facility by the road authority, at least four feet of the shoulder shall be paved. (g)Except within municipal corporate limits,ten-ton staged structural design must be able to carry ten-ton axle loads except during spring load-restriction periods,or year-round if needed for system continuity. Roadbed width must accommodate ultimate ten-ton pave- ment overlay thickness and ultimate 1:4 sideslope. Within municipal corporate limits,min- imum structural design must support nine-ton axle strength. Approach sideslopes must be 1:4 or flatter when the ADT exceeds 400. 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 load- ing is required for all rehabilitated bridges. The curb-to-curb minimum width for new or reconstructed bridges must be no less than either the minimum required lane plus shoulder widths or the proposed lane plus shoulder widths,whichever is greater,but in no case less than the minimum lane widths plus four feet, and in no case less than required per Min- nesota Statutes, section 165.04. Vehicular roadway bridge and underpass structures when two-way bicycle traffic is accommodated: on bridge or underpass sidewalks, the sidewalk clear width shall be no less than eight feet,but preferably ten feet. Whenever practicable,the shoulder/clear zone of an off-road shared use path should be carried across bridges and through underpasses and the minimum structure clear width must be 12 feet. When the full width of the approach shared use path(surface width plus shoulder/clear zone)is greater than the proposed clear width of the structure,then lead-in bicycle safety railing is required at each end of the bridge or underpass. As an alternative to lead-in bicycle safety railing, the surface width of the approach shared use path may be narrowed at a 1:50 taper while maintaining minimum surface width and shoulder/clear zone through the structure. Statutory Authority: MS s 14.386; 14.389; 162.02; 162.09 History: 20 SR 1041; 23 SR 1455;24 SR 1885;29 SR 449;32 SR 608;36 SR 925; 37 SR 697 8820.9922 MINIMUM DESIGN STANDARDS; NEW BRIDGE,BRIDGE REPLACEMENT,OR BRIDGE REHABILITATION PROJECTS AND APPROACH ROADWAYS ON RURAL OR SUBURBAN UNDIVIDED ROADWAYS THAT ARE NOT ON THE STATE-AID SYSTEM. New bridge,bridge replacement,or bridge rehabilitation projects and approach road- ways on rural or suburban undivided roadways that are not on the state-aid system must meet or exceed the minimum dimensions indicated in the following design chart. Existing ADT Lane Width Shoulder Inslope Clear Zone Design Speed (a) Width (b) (c) (d) (feet) (feet) (rise: run) (feet) (mph) 0-49 11 1 1:3 7 30-60 50-149 11 3 1:4 9 30-60 150-400 12 4 1:4 15(e) 30-60 Engineering judgment may be used to choose a lane-width or shoulder-width dimen- sion other than the widths indicated in the chart for roadways. Factors to consider may be safety, speed, population, land use, benefit/cost analysis, traffic mix, farm equipment,