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8820.9936 MINNESOTA RULES <br />Roadways not on the state -aid system are not subject to the minimum structural design strength <br />requirements. <br />The minimum curb -to -curb width of a new bridge must be the required street width, but in no <br />case less than required per Minnesota Statutes, section 165.04. HL-93 loading in the AASHTO <br />LRFD (load and resistance factor design) Specifications is required for new or reconstructed bridges. <br />Rehabilitated bridges must have a load rating factor of at least 0.9 using the AASHTO Manual for <br />Bridge Evaluation, LRFR (load and resistance factor rating) for inventory level. Where the new <br />bridge approach roadway includes elements for the accommodation of pedestrians or bicycles, the <br />new bridge width must also provide for pedestrians or bicycles unless pedestrians or bicycles are <br />otherwise accommodated. <br />For ADT less than 150, the widths of bridges to remain must be at least the sum of the lanes. <br />For ADT greater than or equal to 150, the widths of bridges to remain must be at least the sum of <br />the lanes plus half the sum of the shoulders, parking lane, and curb reaction distance. Bridges to <br />remain must have a load rating factor of at least 0.75 using the AASHTO Manual for Bridge <br />Evaluation, LRFR (load and resistance factor rating) for inventory level. <br />Clearance of 1.5 feet from the face of the curb to fixed objects must be provided when the <br />design speed is 40 to 45 mph. A ten -foot clear zone measured from the driving lane must be provided <br />when the design speed is 50 mph or higher. <br />Unless four lanes are provided, an engineering traffic study is required for traffic volumes <br />greater than 15,000 projected ADT to determine lane configuration and lane use. <br />Statutory Authority: MS s 14.386; 14.389; 162. 02; 162.09; 162.155 <br />History: 20 SR 1041; 23 SR 1455; 24 SR 1885; 29 SR 449; 32 SR 608; 36 SR 925; 37 SR 697; <br />42 SR 485 <br />Published Electronically: November 20, 2017 <br />Copyright © 2017 by the Revisor of Statutes, State of Minnesota. All Rights Reserved. <br />Page 68 of 77 <br />