Traffic Control Plan Development Course Module 3 Devices and Materials

TTC Zone Devices All shall conform to Specs, MN MUTCD, etc. Page 3-1 All shall conform to Specs, MN MUTCD, etc. Placed where they convey message most effectively

Traffic Signing Guide Signs Guidance through work zones Should not interfere with necessary regulatory and warning signs Common: Advance Notice Guide Sign Those with date Those with exact location

Traffic Signing Regulatory and Warning Signs MN MUTCD Parts 2 and 6 Also see handout in Section 3.13

Traffic Signing Supplemental Sign Plates Separate demountable plates Have proper legend Proper letters size and series Properly fastened to sign face Same retroreflective material as sign face Sheeting oriented same as the sign face

Traffic Signing Temporary Sign Covering Care in placement not to damage permanent sign Avoid the use of ropes, wire fasteners or strapping Do not apply tape to the sign sheeting surface Do not use paper or plastic covers Refer to the Sign Framing, Installation and Covering Detail Templates Website

Traffic Signing Sign Panel Overlays Additional Information Care in placement to preserve sign inplace Additional Information MN MUTCD Part 6F (Later)

Business Signing Handout from approved new language to be added to TEM Chapter 8 Be sure to check for updates

Temporary Business Signing in Work Zones 8-6.02 Construction projects have frequently caused disruption of traffic patterns in business areas Temporary business signs are used to improve driver guidance create safer operations reduce the impact on businesses created by construction activities and detours

Temporary Business Signing in Work Zones Page 3-6 Location and Installation of Temporary Business Signs Shall not interfere with permanent or construction signing Hierarchy for sign installation Regulatory warning (permanent and construction) Guide sign

Temporary Business Signing in Work Zones Minimize multiple sign structures Minimum distances Not installed on freeways (are exceptions) Funding

Temporary Business Signing in Work Zones Temporary Business Signing Plan Guidelines District to study all local business Estimate the extent and impact “traffic sensitive” or “regionally sensitive” Work with businesses

Temporary Business Signing in Work Zones Types of Temporary Business Signs Design to guide through easy decisions Trailblazing that is understandable First encountered should be generic in business names

Temporary Business Signing in Work Zones Page 3-8 Business Access Signs

Temporary Business Signing in Work Zones Business Service Signs

Temporary Business Signing in Work Zones Business Identification Signs

Temporary Business Signing in Work Zones Page 3-12 Temporary Business Guide Signs

Pavement Markings in TTC Zones Page 3-15 TEM 8-6.03 Through many work zones, traffic is moved from one lane to another Traffic must be given clear direction as to which pathway to follow Pavement marking modifications are required in long term TTC Zones (which are in place for 3 days or more) that contain transitions or alignment change areas

Pavement Markings in TTC Zones Page 4-7 TEM 8-6.03 Layout 6J-1

Pavement Markings in TTC Zones Page 3-16 TEM 8-6.03 Edge lines through transition and alignment change areas shall be marked with temporary pavement markings with wet retroreflective/recoverable properties TEM 8-6.03 applies to all MnDOT construction and maintenance activities with TTC zones of at least 350 feet in length on tangent sections and of 50 feet in length or longer on curves of 6 degrees or greater

Pavement Markings in TTC Zones Page 3-16 TEM 8-6.03 Following are the minimum requirements for pavement markings prior to opening a road to traffic Multi-lane Undivided Roadways - all double yellow centerlines, lane lines, and broken line stripe pavement markings Multi-lane Divided Roadways - all lane lines Three and Five Lane Roadways with Two-Way Left Turn Lanes - all solid yellow lines with yellow, broken line stripe pavement markings and lane lines (for five lane sections) Two Lane Undivided Roadways - all centerlines

Pavement Markings in TTC Zones Glossary Pavement Markings Definitions Temporary Pavement Marking Pavement markings placed for staging of traffic on long term projects Interim Pavement Marking Pavement Markings that are a thinner marking applied in order to maintain traffic until the next lift or permanent markings can be placed

Pavement Markings in TTC Interim Marking Guidelines Projects greater than 1.25 miles in length use the same cycle length as final pavement markings minimum of 2 feet in length Projects >350 feet, < 1-1/4 miles in length Match the cycle length on either end Figure 6F-8a and 8b of MN MUTCD (later) Interim Pavement Marking Template Sheet (next slide)

Pavement Markings in TTC Interim Marking Guidelines Projects greater than 1.25 miles in length use the same cycle length as final pavement markings minimum of 2 feet in length Projects >350 feet, < 1-1/4 miles in length Match the cycle length on either end See Figure 6F-8a and 8b of MN MUTCD

Pavement Markings in TTC Interim Marking Guidelines Material specifications and tolerances will be the same as for final pavement markings Exception: When final pavement markings are to be epoxy, and paint is used for interim solid lines, a 10-mil thick layer application of paint shall be used

Pavement Markings in TTC Interim Marking Guidelines In areas where paint or tape will not adhere to the surface, TRPMs may be used to simulate a centerline

Pavement Markings in TTC Interim Marking Guidelines The minimum required interim pavement markings shall be installed: Prior to opening the roadway to traffic and Should not be left in place for more than 14 calendar days unless they meet the requirements of temporary or final markings

Pavement Markings in TTC Interim Marking Guidelines Minimum required interim pavement markings include: Multi-lane Undivided Roadways all double yellow centerlines, interim lane lines, and interim broken line stripe pavement markings Multi-lane Divided Roadways all interim lane lines

Pavement Markings in TTC Interim Marking Guidelines Minimum required interim pavement markings include: Three and Five Lane Roadways with Two-Way Left Turn Lanes all solid yellow lines with yellow interim broken line stripe pavement markings and interim lane lines (for five lane sections) Two Lane Undivided Roadways all centerlines, turn lanes, bypass lanes, and outlines for any painted islands

Pavement Markings in TTC Interim Marking Guidelines If ADT < 1500 and the Project Engineer determines that it is not possible or practical to install interim pavement markings on Two Lane Undivided Roadways before opening the road to traffic Figure 6F-8a in Part 6 of the MN MUTCD may be followed, also shown in Interim Pavement Marking Template Sheets If the ADT > 400, then this layout shall be limited to three days

Pavement Markings in TTC Temporary Pavement Marking Guidelines Typically, markings for staging are temporary The material used for temporary pavement markings should be selected based upon whether the marking is placed on the final surface (such as a lane shift crossing the final surface) or not, as well as how long the marking needs to last

Pavement Markings in TTC Temporary Pavement Marking Guidelines Typically, markings for staging are temporary The material used should be based upon whether the marking is placed on the final surface (such as a lane shift crossing the final surface) or not, as well as how long the marking needs to last Are to be installed to the same specifications as final pavement markings

Pavement Markings in TTC Temporary Pavement Marking Guidelines In tapers and transitions, should be installed at a minimum 6” in width Removable preformed pavement marking tape, paint, or epoxy are typically used Should be installed within 14 calendar days Time limitations for installing temporary or final markings begin when construction operations first remove the inplace markings from the roadway

Pavement Markings in TTC Temporary Pavement Marking Guidelines Edge lines through transition and alignment change areas shall be marked with temporary pavement markings with Wet Retroreflective/Recoverable (WR) Properties Discussion on upcoming slide, and page 3-19 of the manual

Pavement Markings in TTC Temporary Pavement Marking Guidelines The following WR pavement markings consist of a combination of one or more products to achieve the required properties Temporary pavement marking tape lines supplemented with TRPMs Temporary WR pavement marking tape lines Pavement marking paint or epoxy lines supplemented with TRPMs Pavement marking paint or epoxy lines with WR elements

Pavement Markings in TTC Page 3-19 Wet Retro-reflective Properties Retains retroreflectivity, presence, and color when wet or submerged in water Consist of Solid temporary pavement marking tape lines supplemented with TRPMs (temporary raised pavement markings) or Solid temporary wet retroreflective pavement marking tape lines or Solid pavement marking paint or epoxy lines supplemented with TRPMs (temporary raised pavement markings) or Solid wet retroreflective pavement marking paint or epoxy lines

Pavement Markings in TTC Final Pavement Markings Refer to TEM Chapter 7 Temporary Raised Pavement Markings TRPMs are normally used with construction zone markings May be used to simulate solid lines See Standards for TRPMS on APL/QPL

Pavement Markings in TTC Page 3-17 TRPM Guidelines TRPMs are to be replaced when they become damaged removed by traffic TRPMs shall not be between October 1 and May 1 because of snowplowing operations Another type is “peel and stick” May be used to simulate solid lines without the use of any other pavement marking material used to supplement other types of pavement markings

Pavement Markings in TTC Page 3-20 Pavement Marking Removal Scarring Removed marking can be confusing Overly aggressive techniques can leave scars

Pavement Markings in TTC Spec Book on Pavement Marking Removal

Pavement Markings in TTC Special Provisions

Channelizing Devices Classified into 3 types Type A Type B Type C

Channelizing Devices Surface Mounted (Centerline) Delineators Delineation devices that may be used as center lane dividers to separate opposing motor vehicle traffic on a two-lane, two-way operation Are separate pay items for “Tube Delineator” and “Replace Tube Delineator”

Channelizing Devices Quick Reference Chart

Temporary Traffic Barriers A number of temporary barriers are used for temporary traffic control www.dot.state.mn.us/products/temporarytrafficcontrol/temporarybarriers.html

Temporary Traffic Barriers Proper temporary barrier system selection and design involves the consideration of a number of specific factors NCHRP Report 350 Duration and ease of installation, maintenance, and removal Exposure and safety risks for workers and road users Expected frequency and severity of impacts Available space for barrier installation and lateral deflection

Temporary Traffic Barriers MN MUTCD Section 6F.85, five primary functions To keep motor vehicle traffic from entering work areas, such as excavations or material storage sites; To separate workers, bicyclists, and pedestrians from motor vehicle traffic; To separate opposing directions of motor vehicle traffic; and To separate motor vehicle traffic, bicyclists, and pedestrians from the work area such as false work for bridges and other exposed objects; and To protect drop-offs of greater than 12 inches on longer term projects when a suitable buffer lane cannot be provided

Temporary Traffic Barriers Crashworthiness Crashworthy Characteristic of roadside devices that have been successfully crash tested in accordance with a national standard such as the National Cooperative Highway Research Program Report 350, “Recommended Procedures for the Safety Performance Evaluation of Highway Features All temporary traffic control devices shall be crashworthy FHWA requires successful crash testing in accordance with the NCHRP Report 350 or AASHTO MASH

Temporary Traffic Barriers Crashworthiness Key Points of MASH All new testing will be done following MASH evaluation techniques Hardware accepted under NCHRP Report 350 is appropriate for replacement and new installation Retesting is not required As of January 1, 2011, all new products must be tested using MASH crash test criteria for use on the National Highway System (NHS)

Temporary Traffic Barriers Anchoring To control or eliminate lateral deflection close to pavement edge drop-offs and in other situations where deflection space is limited, barrier sections may be anchored to the pavement Bridge Department has a memo, “Interim Guidance for Installation of Temporary Barriers on Bridges and Approach Panels”

PPCB Majority of temporary barriers used in Minnesota are portable precast concrete barriers MN MUTCD for Info

Moveable Barrier Source: Barrier Systems Inc.

Portable Non-Concrete Barrier PPCB is the most widely used positive protection device in use today PPCB does have a low initial cost and are readily available They also are quite heavy and creates issues when required on a bridge project and during transport Other barrier systems (such as steel) are available Generally higher upfront cost

Water Filled Barrier Water-filled barrier in APL Barriers shall be certified by the FHWA as meeting or exceeding the requirements of the NCHRP 350 The installer shall install according to the manufacturer's installation instructions

Barrier End Treatments Upstream leading ends that are present shall be appropriately flared or protected with properly installed and maintained crashworthy cushions

Barrier End Treatments Crash cushions systems that mitigate the effects of errant vehicles that strike obstacles, either by smoothly decelerating the vehicle to a stop when hit head-on redirecting the errant vehicle A typical barrier end treatment can be found at, http://www.dot.state.mn.us/trafficeng/workzone/doc/PCBendtreatment.pdf

Truck Mounted Attenuators Energy-absorbing devices attached to the rear of shadow trailers or trucks When used, the shadow vehicle with the attenuator is located in advance of the work area, workers, or equipment to reduce the severity of rear-end crashes from errant vehicles Vehicle is positive protection for the workers and the attenuator is positive protection for the driver

Portable Changeable Message Signs (PCMS)

Portable Signal Systems Portable Traffic Control Signals are either Trailer Mounted or Pedestal Mounted Approved products and specifications for portable signal systems can be found on the APL

Automated Flagging Assist Device Enable the operator to be positioned out of the lane of traffic Capable of displaying a STOP message followed by a SLOW message without the need for a flagger Can be remotely operated by a one operator Single operator may only be used on roadways with unobstructed sight lines, less than 1500 ADT, and less than 1000 feet between the devices

Flashing Arrow Boards Part 6 of MN MUTCD See APL/QPL

Little Know Resources MnDOT owned temporary bridge Overhead sign structure Dynamic Speed Display Signs (DSDS) Automated flagger assistance device (AFADs) Others?

Approved/Qualified Products (APL/QPL) list of approved products

MN MUTCD 6F.1 Types of Devices 6F.2 General Characteristics of Signs 6F.3 Sign Placement

MN MUTCD

MN MUTCD

MN MUTCD 6F.4 Sign Maintenance 6F.5 Regulatory Sign Authority 6F.6 Regulatory Sign Design 6F.7 Regulatory Sign Applications Refer to other section in MN MUTCD

MN MUTCD Page 3-66 Type A Channelizing Devices Figure 6F-7

MN MUTCD Page 3-77 6F.77 Pavement Markings Figure 6F-8a

MN MUTCD

MN MUTCD Page 3-85 6F.85 Temporary Traffic Barriers

MN MUTCD 6F.86 Crash Cushions 6F.87 Rumble Strips 6F.88 Screens