maintenance and protection of traffic (mpt) – hdm ch 16
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Maintenance and Protection of Traffic (MPT) – HDM Ch 16
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GoalSafe and adequate maintenance of traffic
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IssuesWhere is traffic going to go?
Off-site detourOn-site detour
Staged ConstructionTemporary roads and rampsTemporary structure
When can contractor work?Anytime?Non-peak hours?Night?
What signs/markings are needed?Consistency with MUTCD
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OthersDo peds and bicyclists need accommodation?Are dedicated police traffic services needed?What will be sequencing of MPT?What are costs?Can capacity and LOS be maintained?
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Off-Site DetoursUse of state, county or local roads Detour lengths?Must look @ improvements necessary to
handle increased traffic volumes:Pavement widths and thicknessesStructuresGuide RailingSigns/SignalsLateral Clearances
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On-Site DetoursStaged Construction (build a portion at a
time)Temporary Roads and RampsTemporary StructuresMisc:
Must maintain driveway accessMaintain one or two lanes?Should detours be paved?
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ToolbagFlaggersPavement markingsSigns Channelizing Devices (cones, tubular markers,
drums, barricades)
BarriersArrow panelsLightsTraffic SignalsRumble Strips
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Show Overheads
Must consider how phasing will impact placement of materials
Cross-sections can be used as a tool
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Facilities for Bikes – HDM Ch 17
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BicyclistsImprovements:
Grates-eliminate or use special gratesRR crossing-90 degree crossings or reduce
flangeway widthPavements-Eliminate irregularitiesTCS-Check clearance interval
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Bicycle Provisions
Wide Curb lanesUrban areas14’ of usable pavt width (wider if possible)
ShouldersRural areas>= 4’ (wider if vehicle speed > 35 mph, >5%
HV, obstructions, children, ped use of shoulders
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Shared Lane
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Bicycle ProvisionsBicycle Lane (portion of roadway
designated for bicyclists)Used on bicycle routes mapped by MPO’s4’ min. widthCan be conflicts
Bicycle Path (bikeway physically separated from veh. Traffic)Design similar to road
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Bike Lanes
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Bike Lane w/ Parking
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Facilities for Peds – HDM Ch 18
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Pedestrians-Importance:2000 Census:
New York State--30% of residents don’t own cars
Estimated pedestrian AADT-- 20 million tripsAs population ages, expect more pedestrian
use
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Pedestrians and Bicyclists
By law, pedestrians and bicyclists can use unlimited access highways and streets.
Low Volume Facilities-share roadway w/ vehicles
High Volume Facilities-best to separate traffic streams Reduce accident potential Decrease travel time
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MaintenanceNYSDOT does not maintain sidewalks,
bikepaths or bicycle parking facilities.
Local government agency must pass a resolution agreeing to maintain these facilities before they are built (new policy?)
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Assessing Needs-Land Use1. Residential2. Business/commercial3. Mixed commercial/residential4. Industrial5. Recreational6. Educational7. Agricultural/Open Space
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Assessing Needs-Generators1. Major employment centers2. Schools3. Parks4. Shopping Centers5. Residential Neighborhoods6. Medical Centers7. Colleges and Universities8. Bus Stops9. Transit Stations10. Recreation Areas
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Existing CharacteristicsSpecial User GroupsTrip PurposeFrequency of Use Volumes
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Existing AccommodationsLocations of walkways, bikeways, shoulders
and worn pathsIncomplete systemsExisting signingExisting conditionsExisting features than enhance/reduce
feasibilityExisting Right-of-Way
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OthersLocal plansAccident HistoryExisting Site Characteristics:
ParkingLightingCrosswalks SignalsDrainageRoadway Surface Condition
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Pedestrian FacilitiesSidewalks
5’ minimum (see next slide)2% cross slope7’ minimum near parking lanes6’-6” vertical clearance
Shoulders (if no sidewalks)Greater than or equal to 4’
CrosswalksTraffic Control FeaturesHandicapped Accessibility Features
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Ped Accommodations Not Warranted
Peds prohibited by lawCost disproportionate to needSparse Population-Absence of Need