Maintenance and Protection of Traffic (MPT) – HDM Ch 16

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