maintenance and protection of traffic (mpt) – hdm ch 16
Post on 20-Dec-2015
216 Views
Preview:
TRANSCRIPT
Maintenance and Protection of Traffic (MPT) – HDM Ch 16
GoalSafe and adequate maintenance of traffic
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
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?
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
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?
ToolbagFlaggersPavement markingsSigns Channelizing Devices (cones, tubular markers,
drums, barricades)
BarriersArrow panelsLightsTraffic SignalsRumble Strips
Show Overheads
Must consider how phasing will impact placement of materials
Cross-sections can be used as a tool
Facilities for Bikes – HDM Ch 17
BicyclistsImprovements:
Grates-eliminate or use special gratesRR crossing-90 degree crossings or reduce
flangeway widthPavements-Eliminate irregularitiesTCS-Check clearance interval
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
Shared Lane
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
Bike Lanes
Bike Lane w/ Parking
Facilities for Peds – HDM Ch 18
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
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
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?)
Assessing Needs-Land Use1. Residential2. Business/commercial3. Mixed commercial/residential4. Industrial5. Recreational6. Educational7. Agricultural/Open Space
Assessing Needs-Generators1. Major employment centers2. Schools3. Parks4. Shopping Centers5. Residential Neighborhoods6. Medical Centers7. Colleges and Universities8. Bus Stops9. Transit Stations10. Recreation Areas
Existing CharacteristicsSpecial User GroupsTrip PurposeFrequency of Use Volumes
Existing AccommodationsLocations of walkways, bikeways, shoulders
and worn pathsIncomplete systemsExisting signingExisting conditionsExisting features than enhance/reduce
feasibilityExisting Right-of-Way
OthersLocal plansAccident HistoryExisting Site Characteristics:
ParkingLightingCrosswalks SignalsDrainageRoadway Surface Condition
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
Ped Accommodations Not Warranted
Peds prohibited by lawCost disproportionate to needSparse Population-Absence of Need
top related