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ITE URBAN GEOMETRIC DESIGN HANDBOOK -
URBAN COLLECTOR STREETS
Paul Mackey2004 District 1 Meeting, Burlington, VT
URBAN GEOMETRIC DESIGN HANDBOOKURBAN GEOMETRIC DESIGN HANDBOOK
Ten chaptersIn the same style as the TEH, TCDH and the TPHNew demands on design:
Health promotionWalkingCycling
Overview; design details to follow
CharacterizationCharacterization
Urban areas : population of 5,000 or moreRural areas outside the boundaries of urban areasSmall towns and villages do not easily fit this scheme
Ambiguous nature of collectorsAmbiguous nature of collectors
Local streets for accessArterials for traffic flowCollectors for both, in about equal proportionsA lot of guidance is inappropriate
Residential, commercial, industrial, institutional
Residential, commercial, industrial, institutional
A collector street may provide different services along its lengthThere is then a need to adjust the designThe design vehicle may changeCollectors are good streets for non–residential land uses or higher density housing
Typical traffic flowsTypical traffic flows
Residential collector below 8,000 vpdIndustrial/Commercial collector 1,000-12,000 vpdSingle travel lane should normally be sufficient
Access for multiple usersAccess for multiple users
Pedestrians require sidewalks in residentialand commercial areas: one side or both?Industrial areas?Institutional areas, schools in particular?Curb extensions as standard featuresBike facilities: bike route or bike lane?Transit
Choosing the optimal operating speed
Choosing the optimal operating speed
A move away from looking only at design speedIHSDMIndustrial areas 35-40 mphResidential areas 30 mphElementary school areas 20-25 mph
Designing to obtain an operating speedDesigning to obtain an operating speed
Designing up front to avoid traffic calming retrofitsUse of maximum unimpeded street length or stops can be considered for local streetsHorizontal curvatureWidth of the paved surfaceLongitudinal sight distance (also vertical curvature)Lateral sight distance
Traffic FlowTraffic Flow
Uninterrupted movement between collectors and arterialsUsually one lane at intersectionsIf more than one, refuge island to facilitate pedestrian crossingsSingle lane roundabouts at collector/collector intersections
Cross-sectionCross-section
Street width and parking: zoning by-law requirementsCurb extensionsPutting homogeneous width into questionLane width and bike facilities
Cross-section (2)Cross-section (2)
Boulevard or not – snow removalCurbs and roadside obtstructionsBus bays or bus bulbsCurb cut sidewalks or raised crosswalks
Trade-offsTrade-offs
Restrictions and trade-offs are plentifulAssigning limited ROWHelp in understanding the impacts and the trade-off process
Recommended