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Home My WebLink AboutRoadway Design Parameters pptwar®�x CITY OF IOWA CITY Roadway Design Parameters City Council Work Session May 29, 2018 Roadway Design Parameters • Lane Width • Curb Offset • Clear Zone • Curb Radius • Design Speed • On -Street Parking • Street Trees • Bike Lanes • Sidewalk • Subbase war®�x CITY OF IOWA CITY Lane Width Recommended Width — 10' Recommended Alternative Situation — 11' — On transit or truck route without a bike lane buffer Allowed — Shared lanes on local streets — Based on pavement width, not lane width — Current options • 22' — two-way traffic and parking on one side • 26' — two-way traffic and parking on one side 0 28' — two-way traffic and parking on two sides war®�x CITY OF IOWA CITY Curb Offset Preferred Width — 1.5' Allowable Width — o° war®�x CITY OF IOWA CITY — When bike lane, parking or other buffer area is provided Clear Zone Preferred Minimum Width — 6' on streets with speed limit greater than 25 mph — 3' on streets with speed limit of 25 mph or less • Minimum — 1.5' • Allowed Deviations — As required by funding source war®�x CITY OF IOWA CITY Curb Radius Paved Corners — 10' Radius — Downtown area Unpaved Corners — 25' Radius — Outside of Downtown area war®�x CITY OF IOWA CITY Design Speed Speed Limit 25mph war®�x CITY OF IOWA CITY • Preferred — 8' Lane • Minimum — 7' Lane On -Street Parking x CITY OF IOWA CITY Street Trees • (Re)Development Requirement • Preferred Minimum Parkway — 9' Width • Minimum Parkway — 6' Width — Limited options • Limitations — Overhead utility lines war®�x CITY OF IOWA CITY Per Master Plan Preferred — 6' Width Minimum — 5' Width Buffered — 7.5' Width Separated — Design required Bike Lanes war®�x CITY OF IOWA CITY Sidewalk Minimum — 5' Width Preferred (Collectors and Arterials) — 6' Width Arterials — 10' Width — One side war®�x CITY OF IOWA CITY Subbase 6" Granular Subbase Subdrain Development Requirement war®�x CITY OF IOWA CITY war®�x CITY OF IOWA CITY Questions and Discussion