City of Burlington Downtown Street Design & Construction Standards Adopted April 16, 2018
b City of Burlington Downtown Street Design Standards
CITY OF BURLINGTON, VT The Great Streets Initiative is a joint project of the Community & Economic Development Office, the Department of Public Works, and the Department of Planning & Zoning. Mayor of Burlington Miro Weinberger Acknowledgments The development of these standards was a collaborative effort by all City Departments involved in the design, installation and maintenance of elements within the downtown public right-of-way. Thank you to the dozens of City staff from the following departments who contributed time, knowledge and insights into the development of this document, which will guide the reconstruction of Burlington's rights-of-way for generations. City Departments Burlington City Arts Burlington Electric Department Burlington Fire Department Burlington Parks, Recreation & Waterfront Burlington Police Department Church Street Marketplace Community & Economic Development Office Department of Planning & Zoning Department of Public Works Great Streets Initiative Project Management Team Kirsten Merriman Shapiro Senior Policy and Project Specialist, CEDO Laura K. Wheelock, P.E. Public Works Engineer, Burlington Department of Public Works Meagan E. Tuttle, AICP Comprehensive Planner, Planning and Zoning Department Great Streets Design & Consulting Team Suisman Urban Design DuBois & King Michael Vergason Landscape Architects WagnerHodgson Landscape Architecture Domingo Gonzalez Associates Urban Rain Design Third Sector Associates Toole Design Group This document is best viewed in spreads using two-page view. The Appendix should be viewed as single pages. Downtown Street Design Standards City of Burlington i
TABLE OF CONTENTS 1. Great Streets for Downtown Burlington...1 What is a Great Street?... 2 Why Great Streets for Burlington?... 5 Using this Document...11 How to Use this Document...12 Who Should Use This Document...13 Applicability...14 Relief from Standards...14 Pilot Materials & Elements...14 Amendments & Updates...14 2. Burlington s Downtown Streets...17 Design Considerations for Project Development...18 The Boundaries of Downtown...19 Existing Conditions...20 Future Influences...30 Design Considerations for Street Corridors...34 Primary East West Streets...36 Primary North South Streets...43 Other Streets...50 3. Building Great Streets...57 Modal Hierarchy...59 Balancing Right-of-Way Zones...60 Public Right-of-Way...61 Roadway and Pedestrian Zones...62 Roadway & Pedestrian Zone Options...66 Great Street Types...67 Commercial Slow Street (66' ROW, 35' Roadway)...68 Commercial Slow Street with Transit (66 ROW, 36 Roadway)...70 Minimum Commercial Street (66 ROW, 28 Roadway)...72 Major Commercial Street (66 ROW, 38 Roadway)...74 Special Commercial Street (99 ROW, 38 Roadway)...76 Downtown Residential Street (66 ROW, 30 Roadway)...78 Street & Intersection Assemblies...80 Commercial Street within 66 ROW...82 Midblock assemblies...82 Cross intersection...84 "T" Intersection...86 Commercial Street with 99 ROW...88 Midblock...88 Cross Intersection...90 Residential Streets with 66 ROW...92 Midblock...92 Cross Intersection...94 Standard Dimensions & Siting Considerations...96 Roadway Zones...98 Pedestrian Zones...101 Grade Changes in Pedestrian Zone...104 Intersection Zones...106 Utilities...110 Element Siting & Considerations...112 Public Placemaking...119 Public Placemaking & Gathering...120 Frontage Zones (Private & Public)...122 Tree Belt/Furnishing Zone (Public)...125 Bumpouts...126 Parking Lane...127 Parklet Guidelines & Setbacks...128 Parklet Materials...133 Bike Corrals...134 Required Buffer Elements...135 Right-of-Way Encumbrances & Permits...136 Existing Encroachments...136 4. Bikeways...139 Bikeway Types...140 General Bikeway Considerations...141 Shared Lane...141 Conventional Lane Adjacent to Curb...142 Buffered Lane Adjacent to Curb...143 Buffered Lane Adjacent to Parking...144 Protected Bicycle Lane...145 Contra-Flow Lane...146 Advisory Lane...147 Intersections...148 Bicycle Crossing Markings...149 Protected Intersections...152 Bicycle Boxes...154 Two-Stage Left Turn Boxes...155 Bicycle Signals...156 Bikeways at Bus Stops...158 Shared Bicycle and Bus Lanes...159 Curbside Bus Stop with Bike Lane Adjacent to Parking Lane...160 Curbside Bus Stop with Buffered Bike Lane Adjacent to Curb...161 Markings, Signage & Materials...163 Bikeway Markings...164 Signage...164 Colored Pavement Materials...166 5. Street Ecology...171 Street Trees...172 Tree Belts..................................... 173 Tree Belt & Green Belt Typologies...176 Brick Tree Belt with Permeable Pavers...177 Green Belt with Turf...180 Tree Planting Details...182 Tree Planting in Turf Green belts & Lawns...183 ii City of Burlington Downtown Street Design Standards
Tree Planting at Tree Grate...184 Tree Planting at Tree Well...185 Tree Well Curb & Fence Details...186 Permeable Paver Installation...187 Tree Protection...189 Soil & Subsurface...190 Tree & Plant Species...194 Tree Species Under Consideration...195 Canopy Trees...196 Medium Trees...206 Small Trees...207 Other Plant Species...212 Stormwater...215 Roadway Zone...218 Stormwater Curb Extensions...218 Green Gutters...222 Rain Gardens...226 Pervious Pavers in Parking Zone (PILOT)...228 Pedestrian Zone...229 Pervious Pavers in Treebelt Zone...229 Stormwater Planters...230 Vegetated Swales...234 Tree Grate Stormwater Planters...236 Sediment Forebays...237 Check Dams & Weirs...238 Capturing Street Runoff...240 6. Lighting...245 Street Lights...246 Lighting Strategy for Great Streets...250 Standard Lighting Assembly...250 Pole Layout & Spacing...252 Lighting Criteria...256 Lighting Quality...257 Light Sources...257 Luminaire Selection & Design Parameters...257 Techniques...258 Adaptive Lighting Control (Dimming) (PILOT)...258 Optional Seasonal Elements...260 Tree Lighting...260 Lighting Elements...262 Decorative Lighting Assembly...263 Banner Arm & Bracket...266 Standard Lighting Assembly...267 7. Materials & Furnishings Palette...269 Materials for Pedestrian & Roadway Zones...271 Roadway Zone Material...272 Painted Pavement Markings...274 Parking Lane...275 Curbs...276 Tree Belt Permeable Pavers...277 Clear Sidewalk & Frontage Zones...278 Crosswalks...280 Curb Ramp...282 Drive Entrances...282 Detectable Warnings/Truncated Domes...284 Furnishings for Pedestrian Zones...286 Benches...288 Movable Chair...292 Movable Table...293 Bike Rack...294 High-Capacity Bike Parking...296 Bike Shelter...297 Bicycle Repair Station...298 Parklet Elements...298 Bollard...300 Planters...301 Trash/Recycling...303 Public Toilets...305 Trench Grate...306 Tree Grate...307 Tree Guard...308 Soil Cells...309 Bus Shelter...310 Parking Meters...311 Traffic Control Signals...312 Signage...313 Wayfinding...315 Public & Event Information...316 8. Appendix...319 Glossary & References...320 Key Terms...321 References & Resources...322 Adoption & Amendments....................... 323 Roadway Zone Details... A-1 Pedestrian Zone Details... A-2 Intersection Zone Details... A-3 Utility Details... A-4 Bikeway Details... A-5 Street Ecology Details... A-6 Lighting Details... A-7 Materials & Furnishings Details... A-8 Signage & Wayfinding... A-9 Click on any of the items in this Table of Contents to navigate directly to the correponding section of the document. Downtown Street Design Standards City of Burlington iii