stationary and slowly moving work zones on rural and urban ... · stationary and slowly moving work...
TRANSCRIPT
Stationary And Slowly Moving Stationary And Slowly Moving Work Zones On Rural And Work Zones On Rural And Urban Roads Urban Roads
Kenneth A. Swain
Session ObjectivesSession Objectives
Identify procedures for the placement of Short Term Stationary and Slowly Moving Work Zones on rural or urban roadways.
Provide a basic understanding on planning work zones
Identify typical deficiencies found in work zones that increase accident risk.
Developing A Work Zone PlanDeveloping A Work Zone Plan
Planning is critical to the efficient and safe performance of work zones and related traffic control activities.
Planning will anticipate actions you need to take
Developing the PlanDeveloping the Plan
Prior to the start of any work activity there are key factors to be addressed in a work zone plan.
Addressing these factors can minimize potential negative impact and liability on the work operation
Key Factors To Be AddressedKey Factors To Be Addressed
Work ClassificationStationaryMoving
Work LocationOn RoadwayOff Roadway
FactorsFactors
Description of workPavement repairShoulder repairDitching etc.
FactorsFactors
Scope of the operationNumber of lanesLength of the work area
DurationMobile (< 15 Min.)Short Duration (< 60 Min.)Short Term (1 Day)Long Term (More Than 1 Day)
FactorsFactors
Occupancy TimeTime required to perform the WorkTime required for setting, cooling or curingDelay timeTraffic control set-up/take-down
What Factors Affect Occupancy What Factors Affect Occupancy Time?Time?
Type and amount of workEfficiency of crewType of equipment/conditionWeatherTraffic
Capacity ProblemsCapacity Problems
CongestionBack-upsDelays
Now that we are aware of factors that can affect our plan
Lets identify typical problems found in work zones that impact motorists
Insufficient Advanced WarningInsufficient Advanced Warning
Inadequate signsInsufficient distance in which to respondUnclear instructions
Inadequate Guidance Or Inadequate Guidance Or DelineationDelineation
Lack of information Poorly placed devicesConflicting pavement markings
Conflicts Created By The Conflicts Created By The Work ActivityWork Activity
Equipment operating or stored outside protected area
Poor HousekeepingPoor Housekeeping
Debris on roadwayWater or mud on pavementWarning devices dirtyNon-functioning devices
Distractions To MotoristsDistractions To Motorists
Unusual traffic control techniques or devices
Additional Factors To ConsiderAdditional Factors To ConsiderAvoid peak travel periods
Avoid holiday periods on primary routes
Avoid starting major projects on Fridays, or Mondays after holidays
Additional Factors To Include Additional Factors To Include
Proper instruction to work crews
Insure that proper equipment and tools are available prior to leaving the facility
Addressing these factors prior to setting up your work zone can minimize your liability in the event an accident occurs
Now lets take a look at the fivecomponents of a work zone
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
5 Components Of A
Traffic Control Zone
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
Advanced Warning Area
Transition Area
Buffer Space
Work Space
Termination Area
WorkzoneWorkzone Traffic ControlTraffic Control
Signs are used to Warn, Guide or Advise, they instruct the motorist how to proceed through the worksite. On most highways where speeds range from moderate to fast three advanced warning signs are typically used.
Work Zone Traffic ControlWork Zone Traffic Control
The First Sign is used to attract the drivers attention
Road Work Ahead
The Second Sign should provide specific information about the situation ahead
One Lane Road Ahead
The Third Sign instructs the motorist what action is being taken
Flagger Ahead Symbol
Roadwork Ahead
One Lane Road Ahead
Flagger Symbol
Principles Of Sign PlacementPrinciples Of Sign Placement
Locate signs where they can be seen.
Place signs so that drivers have time to respond.
Signs should generally be placed on the right side of the roadway.
Let’s look at some slides to see if they meet the sign placement criteria.
Moving Work Zones And Special Procedures
Moving/Mobile Work ZonesMoving/Mobile Work Zones
Mobile work zones differ from stationary work zones Mobile work zones include intermittent stopsVehicle mounted devices are often required
Let’s look at a couple of these devices!
MovingMoving WorkzonesWorkzones/Special /Special ProceduresProcedures
Truck Mounted SignsTruck Mounted ArrowboardTruck Mounted Impact Attenuator (TMIA)
Truck Mounted SignTruck Mounted Sign
TMIATMIA
Let’s look at some typical Moving and stationary work Zones
Work Outside Of ShoulderWork Outside Of ShoulderStationaryConventional highwayWork area beyond shoulderSign – PortableSign placement Low speed < 40mph
150 - 300ft High speed > 40mph
500 - 800ft
On Shoulder On Shoulder –– Short DurationShort DurationStationary or MovingConventional highwaySign truck mountedSign spacing Low speed < 40mph
150 - 750ft High speed > 40mph
300 - 1000ft
Shoulder Shoulder –– Stationary OperationStationary Operation
Conventional highwayWork Area on shoulderSign placement Low speed < 40mph
150 - 300ft High speed > 40mph
500 - 800ft
Two Lane Two Lane –– Mobile OperationMobile OperationConventional highwayLow Volume May use truck mounted signSign placement Low speed <40mph
150 - 600ft High speed >40mph
400 - 1500ft
Two Lane Two Lane –– Mobile MowingMobile MowingConventional/ExpresswayMower encroaching on laneMaximum length of work zone 2 milesSign placement Low speed <40mph
150 - 600ft High speed >40mph
400 - 1500ft
Four Lane DividedFour Lane DividedMobile OperationMobile Operation
Conventional/ExpresswayEach vehicle equipped with static arrow or arrow boardSign spacing
Low volume - slow moving 400ft - 1500ft
High volume - Short Duration600 – 2500ft
Four Lane DividedFour Lane DividedMobile OperationMobile Operation
Conventional Roadway High Volume – High SpeedEach vehicle equipped with static arrow or arrow board and SignFirst vehicle fully in lane should be equipped with TMIA