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 3.12

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

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

Proposed TEM 8-5 8-5.02.030 Temporary Business Signing in Work Zones 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

Proposed TEM 8-5 Page 3-4 8-5.02.031 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

Proposed TEM 8-5 Minimize multiple sign structures Minimum distances Not installed on freeways (are exceptions) Funding

Proposed TEM 8-5 8-5.02.032 Temporary Business Signing Plan Guidelines District to study all local business Estimate the extent and impact “traffic sensitive” or “regionally sensitive” Work with businesses

Proposed TEM 8-5 8-5.02.033 Types of Temporary Business Signs Design to guide through easy decisions Trailblazing that is understandable First encountered should be generic in business names

Proposed TEM 8-5 Page 3-6 Business Access Signs

Proposed TEM 8-5 Business Service Signs

Proposed TEM 8-5 Business Identification Signs

Proposed TEM 8-5 Page 3-10 Temporary Business Guide Signs

Business Impact Mitigation Purpose to: Involve businesses more in the project development process Keep businesses informed regarding project issues Help businesses understand a project and its potential impacts Mitigate construction impacts to businesses as feasible (Includes reducing and, if practical, preventing negative impacts to businesses)

Business Impact Mitigation Threshold Criteria Substantial business impacts? If Yes Designate a project Business Liaison Use the Business Impact Mitigation Checklist Follow the guidelines in the Guidelines section

Business Impact Mitigation Responsibilities of Business Liaison Consult with affected businesses before and during construction Investigate means of mitigating project impacts to businesses Provide information to the businesses before and during construction

Business Impact Mitigation Guidelines Use the Business Impact Mitigation Checklist Identify Businesses Early in Scoping, identify small businesses in the project area (not just within the project termini) List potentially-affected businesses and their contact information

Business Impact Mitigation Guidelines Contact Business Owners Provide information on the project in written format Provide contact information for the Business Liaison Work with businesses to identify potential concerns, and determine preferred methods for future project communications

Business Impact Mitigation Guidelines Identify Potential Impacts Determine the resources needed to identify and evaluate potential impacts Does the project have unique characteristics? businesses in the area have any unique issues? Is there a need for specific expertise? Does the project scale warrant extra resources?

Business Impact Mitigation Guidelines Contact Local Governments Consult with city and county governments to identify potential impacts and discuss potential mitigation measures Contact MN Dept. of Employment and Economic Development Assistance in determining a list of business-development organizations that may offer resources to affected businesses

Pavement Markings in TTC Page 3-17 Definitions Final Pavement Marking The pavement marking that will be installed until the next time the pavement marking is scheduled to be renewed (typically one or more years). Final markings would include full length centerline markings, edgelines and messages

Pavement Markings in TTC Definitions Temporary Pavement Marking the pavement marking that will be installed in staged long-term temporary traffic control zones The temporary markings will either be removed or covered with another pavement surface prior to the application of the final markings The temporary markings would include full length centerline markings, edgelines and messages. All temporary pavement markings shall be in conformance Part 6 and Part 3 of the MN MUTCD

Pavement Markings in TTC Definitions Interim Pavement Marking any pavement markings that are not the final marking or is temporarily placed for staging purposes Temporary Raised Pavement Marker (TRPM) retroreflective pavement markers applied to the roadway surface which maintain retroreflective properties during wet weather conditions TRPMs are used alone to substitute for pavement marking segments or to provide wet weather capabilities to other pavement markings

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 Temporary Pavement Marking Guidelines Give traffic clear path to follow Typically, markings for staging are temporary Of pavement to be overlaid or reconstructed, temp tap or marking paint, or epoxy can be used

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 May be used to simulate solid lines See Standards for TRPMS on APL/QPL

Pavement Markings in TTC Temp. Pavement Markings Tech Memo TM 08-10-T-02 Provide an appropriate pavement marking on all highways, 365 days per year An appropriate pavement marking is one that meets or exceeds the standards defined in the MN MUTCD During winter weather events, pavement markings should provide presence after pavement is clear of snow and ice

Pavement Markings in TTC 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 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

Surface Mounted (Centerline) Delineators Page 3-29 Devices that may be used as center lane dividers

Portable Changeable Message Signs (PCMS)

Portable Signal Sytems 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

Crash Cushions and Attenuators Non-Redirective (Gating) Redirective (Non-Gating)

Ballast Sandbags are the most common ballast Should be constructed of a material which will allow the bag to break and disperse Other ballasting systems may be used on some temporary traffic control devices provided they are crashworthy.

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 Type A Channelizing Devices Figure 6F-7

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

MN MUTCD

MN MUTCD 6F.85 Temporary Traffic Barriers

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