office of traffic, safety and technology module 3 devices and materials traffic control plan...

Module 3Devices and Materials

Traffic Control Plan Development Course

TTC Zone Devices

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– Care in placement to preserve sign

inplaceAdditional 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

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

– Business Access Signs

Proposed TEM 8-5

– Business Service Signs

Proposed TEM 8-5

– Business Identification Signs

Proposed TEM 8-5

– 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)

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

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

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

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

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?

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

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

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

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

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

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

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

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

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 Marking Removal Scarring– Removed marking can be confusing– Overly aggressive techniques can

leave scars

Spec Book on Pavement Marking Removal

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/tempora

rytrafficcontrol/temporarybarriers.html

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 39

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

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

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)

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”

Majority of temporary barriers used in Minnesota are portable precast concrete barriers

MN MUTCD for Info

Moveable Barrier

Source: Barrier Systems Inc.

gy Portable Non-Concrete

BarrierPPCB 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 cost46

Water Filled Barrier

Water-filled barrier in APLBarriers 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

gy Truck Mounted

AttenuatorsEnergy-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) DelineatorsDevices 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

gy Automated Flagging Assist

DeviceEnable 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 54

Flashing Arrow Boards

Part 6 of MN MUTCDSee APL/QPL

Crash Cushions and AttenuatorsNon-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 Devices6F.2 General Characteristics of

Signs6F.3 Sign Placement

MN MUTCD

6F.4 Sign Maintenance6F.5 Regulatory Sign Authority6F.6 Regulatory Sign Design6F.7 Regulatory Sign ApplicationsRefer 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

6F.85 Temporary Traffic Barriers

MN MUTCD

6F.86 Crash Cushions6F.87 Rumble Strips6F.88 Screens

office of traffic, safety and technology module 3 devices and materials traffic control plan...

office of traffic

temporary sign

impact traffic sensitive

disruption of traffic

technology module

permanent sign

construction guide sign

business service signs

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