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Attachment 3 <br />MINNESOTA RULES 8820.9936 <br />8820.9936 MINIMUM DESIGN STANDARDS, URBAN; NEW OR RECONSTRUCTION <br />PROJECTS. <br />New or reconstruction projects for urban roadways without a designated on -road bicycle facility <br />must meet or exceed the minimum dimensions indicated in the following design chart. <br />Projected Traffic Volume <br />Design Speed <br />mph <br />Lane Width <br />(a) <br />feet <br />Curb Reaction <br />Distance <br />(c) <br />feet <br />Parking Lane <br />Width <br />(e) <br />feet <br />ADT < 10,000 <br />30-45 <br />(b) 10-11 <br />1-2 (d) <br />7-8 <br />50 or over <br />11-12 <br />2 <br />8-10 <br />ADT> 10,000 <br />30-35 <br />(b) 10-11 <br />1-2 (d) <br />7-10 <br />40-45 <br />11-12 <br />1-4 <br />7-10 <br />50 or over <br />11-12 <br />2-4 <br />INot allowed <br />Engineering judgment may be used to choose a lane -width dimension other than the widths <br />indicated in the chart for roadways. Factors to consider include safety, speed, population/land use, <br />benefit/cost analysis, traffic mix, peak hourly traffic, farm equipment, environmental impacts, <br />terrain limitations, bicycle traffic, pedestrian traffic, other nonmotorized uses, functional <br />classification, or other factors. Widths less than those indicated in the chart require a variance in <br />accordance with parts 8820.3300 and 8820.3400. <br />(a) Twelve feet should be considered in industrial areas. One-way turn lanes must be at least <br />ten feet wide, except 11 feet is required if the design speed is 50 mph or higher. <br />(b) Ten feet may be considered where truck or bus volumes are relatively low, rights -of -way <br />are constrained, and design speeds are 35 mph or less. Eleven feet minimum is required on four -lane, <br />undivided facilities. <br />(c) Curb reaction must be provided only where parking is not provided. <br />(d) The state -aid engineer may approve a zero -foot curb reaction distance where the cross-section <br />is constrained, appropriate curb types are used, and drainage collection is adequate. The curb must <br />be constructed without a gutter or monolithically with the adjacent traveled way. <br />(e) The roadway ADT and the vehicle mix must be considered when determining parking lane <br />width. In commercial or industrial areas, the minimum parking lane width is eight feet. <br />One-way streets must have at least two through -traffic lanes. <br />When a median is included in the design of the two-way roadway, a one -foot minimum curb <br />reaction distance to the median is required on either side of the median. Minimum median width <br />is four feet. <br />Urban design roadways must be a minimum nine tons structural axle load design. <br />Copyright © 2017 by the Revisor of Statutes, State of Minnesota. All Rights Reserved. <br />Page 67 of 77 <br />