2011 Road School Work Zone Traffic Control Handbook
2011 Road School Work Zone Traffic Control Handbook
Work Zone Traffic Control Handbook Objectives § Discuss the purpose of the WZTCH and who should use it § Discuss the changes from the WZSM to the WZTCH
Work Zone Traffic Control Handbook Purpose of the Handbook § Provide a quick reference § Meets the requirements of the IMUTCD § Adds some typical installations
Work Zone Traffic Control Handbook Who Should and Who Can Use the Handbook § State personnel and any permittees setting out a work zone on State Right-Of-Way are to use this manual § Because it meets and in a few places, exceeds, the IMUTCD, anyone setting up temporary traffic control may use it § Contractors of INDOT are not required to use it
Work Zone Traffic Control Handbook § § Prior revisions were effective on 10/16/2009 Title has been changed: § Originally - Work Zone Safety Manual § Now - Work Zone Traffic Control Handbook § Distinguishes it from the INDOT Safety Manual § Better reflects it’s focus Re-numbered the pages Updated to meet IMUTCD
Work Zone Traffic Control Handbook Changes made throughout the handbook § § § References to MUTCD changed to 2008 IMUTCD “Protection Vehicle” changed to “Shadow Vehicle” Sign and buffer spacing adjusted to 2008 IMUTCD Original Revised
Work Zone Traffic Control Handbook Page 1 Worksite traffic control diagrams provide minimum Introduction The worksite diagrams in this handbook Traffic Control Devices requirements, additional trafficiscontrol or protection can be The purpose of this handbook to present guidelines for provide minimum requirements. Additional trafficwork Thetraffic following types ofsupplement traffic control are used added. Thiscontrol manual covers work setups asdevices presented in the zone and to basic work zone safety control or protection canmanagement be added. system INDOT maintenence/traffic in work. This zone traffic control: training. handbook covers the basic requirements of Part VI of • Signs the 2008 Indiana Manual on Uniform Traffic Control Devices (IMUTCD) with particular emphasis on short term work • Channelizing Devices sites. For long term work sites the IMUTCD and INDOT • Warning Lights standard drawings should be consulted. These requirements Displaysmaintenance, traffic, and utility work apply • Arrow to construction, • Pavement Markings zones. • Portable Changeable Message Signs
Work Zone Traffic Control Handbook Page 5 Removal – When work is suspended for short periods, all signs that are no longer appropriate shall be removed, covered, turned, or laid flat so they are not visible to drivers. Signs laid flat should not be placed such that posts present a danger to a motorist if they run over the sign.
Work Zone Traffic Control Handbook Page 7 Notes: 1. Stripes on barricade rails slope downward at an angle of 45 degrees toward the direction traffic is to pass. 2. Barricade rail stripe widths shall be 6 inches except where rail lengths are less than 36 inches, then 4 inch wide stripes may be used. 3. The sides of barricades facing traffic shall have retroreflective rail faces. All channelizing devices shall meet National 4. All channelizing devices shall meet AASHTO Manual Cooperative Highway Research Program (NCHRP) for Assessing Safety Hardware (MASH) Requirements. Report 350 Crash Test Requirements.
Work Zone Traffic Control Handbook Page 8 Spacing Cone or barrel spacing for straight-a-ways should be: The spacing of channelizing devices (cones, etc. ) should be a • At 55 mph & below: 1 cone for every 80’ (every other skip) distance in feet equal to the speed limit in mph when used for • At 60 mph & above: 1 cone for every 120’ (every 3 skips) taper channelization, and a distance in feet equal to 2. 0 times the speed limit in mph when used for tangent channelization. See Table II on Page 13. Channelizing Devices Alternatively, the spacing may be as follows: Channelizing devices are used to warn and alert road users Channelizing devices are used to warn and alert drivers of of conditions created by work activities and to guide road Spacing for straight-a-ways: conditions in work zones, to protect workers, and to guide • 20 to 40 mph: 1 cone for every 40’ (every skip) users. Channelizing devices include cones, tubular and direct drivers and pedestrians safely. Channelizing • 40 to 55 mph: 1 cone for every 80’ (every other skip) markers, vertical panels, drums, barricades, and barriers. devices include cones, tubular markers, vertical panels, • 60 mph & above: 1 cone for every 120’ (every 3 skips)” drums, barricades, and barriers.
Work Zone Traffic Control Handbook Page 9 Warning Lights ON VEHICLES—Vehicle hazard lights, four-way flashers, shall not be used as Warning lights may supplement retroreflectorization on warning shall not be used as vehicle warning lights, but may be used to supplement vehicle ON SIGNS AND CHANNELIZING DEVICES—Warning lights and channelizing devices. They are especially useful warning lights. Vehicle warning lights are defined in the used to supplement vehicle warning lights. Vehicle may supplement retroreflectorization on warning and in areas prone to fog or frequent inclement weather. useful Warning lightsprone shall INDOT Vehicle Lighting Policy. warning lights are defined in the INDOT Vehicle Lighting channelizing devices. They are especially in areas have minimum of 30 Warning inches. The Policy. Care should be taken to avoid presenting to fogaor frequentmounting inclementheight weather. lightsprincipal shall have types and uses of warning lights are: (30) inches. The principal excessive and confusing numbers of vehicle lights to the a minimum mounting height of thirty motorists. Work vehicles in protected areas which are not types and uses of warning lights are: being utilized should have their lights switched off except when entering or exiting the zone.
Work Zone Traffic Control Handbook Page 10 Arrow Displays An arrow board in the arrow or chevron mode may be used to supplement signs and other devices for lane closures on multilane roadways. An arrow board in the caution mode shall be used only for shoulder work, blocking the shoulder, or roadside work near the shoulder. Arrow boards shall not be used on two-lane two-way roads in arrow or chevron mode. Arrow boards may only be used in caution mode on two-lane two-way roads. Arrow boards will be equipped with a dimmer switch (manual or automatic) for night time work
Work Zone Traffic Control Handbook Page 13 The spacing of channelizing devices (cones, drums, etc. ) in a taper should be a distance in feet equal to the speed limit in mph.
Work Zone Traffic Control Handbook Page 14 Supervisor‘s Checklist 1. Have a traffic control plan before going to the work site. 2. Ask yourself, “What is the driver‘s view of the work site”, (at night, during peak hours, etc. ) Whenever possible, after setting up, drive during peak hours, etc through the zone to see it from the motorist perspective. 3. Investigate crashes/incidents to identify if changes are needed in the traffic control plan. 4. For overhead work, traffic control is required for affected lane(s). 5. If working on an interstate, check to see if an Interstate Lane Closure Waiver is needed and/or approved for the location.
Work Zone Traffic Control Handbook Page 17 Night Time Traffic Control Channelizing Devices: Cones must be 28” tall and Message Boards: Portable be used to have retroreflective tape. message Barrelssigns mustmay have alert the public oftape the work ahead. See page(as 6 for specific retroreflective or Warning Lights required). details and how the sign should be used. It can be a good See page 4 panel for specific and how sign should bethis Barricade mustdetails be Type 3. the (See page 7 of practice to display a message a day ahead of the work warning used). It isfor a good practice to display theamessage a day ahead. manual more details). It is also good practice to about the coming change. have night patrols available to reset traffic control devices as needed.
Work Zone Traffic Control Handbook Page 19 & 20 Shadow vehicle for INDOT shall have a minimum Protection vehicle for INDOT shall be a dump truck loaded with sand parked at an angle. If a TMA weight of 10, 000 lbs. A load of sand may be is used, the truck shall be loaded per TMA required to obtain the minimum weight, but it manufacturers specifications (load of sand may should not be permitted to freeze during winter not be needed with a TMA), parked parallel to operations. If a TMA is used, the truck shall be traffic, front wheels angled away from traffic, and loaded per the TMA manufacturer’s specifications. may be either a dump or 2 ton stakebed vehicle. Shadow vehicles should be parked parallel to Drawings are not to scale. The drawings do not traffic and have the front wheels angled away from depict the number of channelizing devices to use. traffic.
Work Zone Traffic Control Handbook Page 26 A tangent section was added to the shifted lane
Work Zone Traffic Control Handbook Page 27 Shadow Vehicle added Unneeded Arrow Boards were removed
Work Zone Traffic Control Handbook Page 29 Unneeded Arrow Boards were removed
Work Zone Traffic Control Handbook Page 30 Arrow Board replaced with Shift Arrow Sign
Work Zone Traffic Control Handbook Page 32 Added note for the yield sign
Work Zone Traffic Control Handbook Page 35 Changed the color of the EXIT sign from green to orange
Work Zone Traffic Control Handbook Page 44 Adjusted labels for shadow vehicle area and buffer space
Work Zone Traffic Control Handbook Page 46 Relocated Arrow Board LEFT LANE MUST TURN LEFT sign changed Arrow Board symbol added to a regulatory sign – An OA is needed
Work Zone Traffic Control Handbook Page 51 Unneeded Arrow Board was removed
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Work Zone Traffic Control Handbook Page 69 Added Note 2 Removed 2 mile length limit Maximum distances for sign spacing
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Work Zone Traffic Control Handbook Original Page 75 removed
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