office of traffic, safety and technology module 2 temporary traffic control overview traffic control...
TRANSCRIPT
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Module 2Temporary Traffic Control Overview
Traffic Control Plan Development Course
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General
A Temporary Traffic Control (TTC) Zone (aka Work Zone)– Work Space– Incident– Controlled by
• TTC Devices (Chapter 3)• Flaggers• Uniformed Law Enforcement• Other Authorized Personnel
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General
Safety is a PRIMARY concernMust provide:
– safe work place– safe route for the pedestrian– safe route for the motorist
This Manual/Course cover longer term TTC that will require plans
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Mn MUTCD Chapter 6B
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Mn MUTCD Chapter 6B
Fundamental Principles of Temporary Traffic Control– Construction, maintenance, utility, and
incident zones can all benefit from TTC– Special plans preparation and coordination
required– Commercial vehicles might need to follow a
different route– Following the fundamental principles of Part 6
will • assist road users • help protect workers in the vicinity of TTC zones
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Mn MUTCD Chapter 6B
Seven fundamental principles of TTC1. General plans or guidelines should be
developed2. Road user movement should be inhibited as
little as practical3. Motorists, bicyclists, and pedestrians should
be guided in a clear and positive manner4. Routine day and night inspections of TTC
elements should be performed5. Attention should be given to the
maintenance of roadside safety6. Training appropriate to the job7. Maintain good public relations
Page 2-2 through
page 2-3
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gy Legal Authority for
TransportationLegal authority for transportation is
found in the Minnesota Statutes, Chapters 160 to 174A
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Federal Regulations
Title 23 of the United States Code (U.S.C) – outlines the role of highways in the United
States Code (www.ecfr.gov/)– Part 630 Subpart J covers Work Zone Safety
and Mobility – Subpart K outlines Temporary Traffic Control
Devices– A copy of Subpart J and K is included in the
Appendix
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Why Signs are Installed
Engineering Standards– MN MUTCD
• A statement of required, mandatory, or specifically prohibitive practice regarding a traffic control device. The verb “shall” is typically used. Standards are sometimes modified by Options
• A statement of recommended, but not mandatory, practice in typical situations, with deviations allowed if engineering judgment or engineering study indicates the deviation to be appropriate. The verb “should” is typically used. Guidance statements are sometimes modified by Options
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MN MUTCD
discussed on Page
2-10
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Why Signs are Installed
Engineering Standards– MN MUTCD
• A statement of practice that is a permissive condition and carries no requirement or recommendation. Options may contain allowable modifications to a Standard or Guidance. The verb “may” is typically used
• An informational statement that does not convey any degree of mandate, recommendation, authorization, prohibition, or enforceable condition. The verbs “shall”, “should”, and “may” are not used in Support statements 10
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Associated Manuals and GuidelineWork Zone Manuals and Guidelines
Website
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Associated Manuals and GuidelineFederal Manual on Uniform Traffic
Control Devices– Federal Highway Administration
(FHWA) publishes the MUTCD– all national design, application, and
placement, standards, guidance, options, and support provisions for traffic control devices
Chapter 6 of the Federal MUTCD related to TTC
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Associated Manuals and GuidelineMinnesota Manual on Uniform
Traffic Control Devices– Minnesota develops and adopts a state
MUTCD– substantial conformance with the
Federal MUTCD– updated in January 2014– Sections 6A through 6K
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Associated Manuals and GuidelineTemporary Traffic Control Zone
Layouts Field Manual (MN MUTCD Chapter 6K)– Part 6 of the MN MUTCD– reprinted as a separate document for
use in field operations– contains the general Temporary Traffic
Control (TTC)– Used by any MN entities to provide
PROPER TTC
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Associated Manuals and GuidelineTraffic Engineering Manual
– updated by the MnDOT OTST– establish uniform guidelines and
procedures– Chapter 8 is related to Work Zone
Traffic Controls
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Associated Manuals and GuidelineStandard Specifications for
Construction (2014 Edition)– contains standard specifications – used and referred to in the design of
• plans • Special Provisions
More info in Chapter 6
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Associated Manuals and GuidelineMinnesota IWZ Toolbox
– For design of Intelligent Work Zones• Travel Time Information• Speed Advisory Information• Congestion Advisory• Stopped Traffic Advisory• Dynamic Merge - Late or Early• Traffic Responsive Temporary Signals• Etc.
Some Warrants at Enterprise website
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Associated Manuals and GuidelineWork Zone Speed Limit Guidelines
– provide a uniform guideline for the proper application of speed limits in street and highway work zones
– Engineering judgment may dictate modifications
More info in Section
2.7.3
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Associated Manuals and Guideline2012 CMS Manual of Practice
– Guide for MnDOT internal stakeholders and external stakeholders
– Info on allowable and prohibited messages
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Signing Overview
Associated Manuals– Minnesota Standard Signs Manual
• The Standard Signs Manual contains a wide variety of standard signs that are used in the state
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Signing Overview
Associated Manuals– Standard Signs Summary
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Size of Sign Example
So What? – 24” x 30” – 48” x 96”
24"
30"
R2-1
6' Tall Person
36"
80"
Front Door
48"
96"
R2-4b
From Signs 101
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Associated Manuals and GuidelineAdditional Manuals and Guidelines
– Previous discussions were a sampling– Fully investigate Work Zone website– Resources are constantly updated
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Tech MemoSubject:
– Minnesota Work Zone Safety and Mobility Policy
Purpose: – To implement the
requirements and guidelines contained in the Code of Federal Regulations, Title 23 Part 630, Subpart J
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Tech MemoINTRODUCTION
– Safety and mobility of road users and highway workers
– Aging Highway System– All involved must commit to safety and
mobility– Start early in the project– Carry through to the end
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gy Work Zone Safety Mobility
Tech MemoAddressed in Three Levels
– 1. Project Level Procedures• Work Zone Mobility Impact Assessment• Transportation Management Plan (TMP)• Plans, Specifications and Estimates
(PS&Es)• Project Temporary Traffic Control (TTC)
Field Observations
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Tech MemoAddressed in Three Levels
– 2. District or Local Agency Level Process and Procedures• Establishment of a Work Zone Safety
Coordinator• Operational Performance Information• Work Zone Crash Data Review
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Tech MemoAddressed in Three Levels
– 3. State Level Processes and Procedures• Statewide Work Zone Data• Statewide Field Reviews• Training• Process Feed-Back Discussions• Statewide Group Activities
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Tech MemoScope
– Apply to federal and non-federal aid– Should be implemented on
maintenance and utility operationsPROJECT LEVEL PROCESSES AND
PROCEDURES– Attention must be given to traffic
mobility and safety from the early stages of development
– Proper TMP can be developed
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Tech MemoWork Zone Mobility Impact
Assessment– Identify the potential impact the
project– provide guidelines for developing the
strategies to mitigate– Implement a general traffic delay
restriction policy for their jurisdiction– May have an established “Lane Closure
Manual”• Metro Lane Closure Manual
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Tech MemoWork Zone Mobility Impact
Assessment– If no Manual
• On 2-lane 2-way roadways, traffic should not be stopped (such as a flagging operation) for greater than 15 minutes
• On multi-lane roadways, traffic volumes should not exceed 1800 vehicles per hour per open lane
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Tech Memo
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Tech Memo
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Tech Memo
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Tech Memo
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Tech MemoTransportation Management Plan
– Prepared with assistance of road authority
– Tasks include listing all potential work zone impacted services, businesses
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Page 2-23 More info in Sec 2.8
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Tech Memo– Refer to Attachment A
• Project Characteristics• Travel and Traffic Characteristics• Corridor, Network and Community Issues• Design, Procurement and Construction
Options• Work Zone Design and Safety Issues• TTC Strategy Considerations• TO Strategy Considerations• PI Strategy Considerations
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Att. A Page 2-32
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Att. B Page 2-36
Work Zone Safety Mobility Tech MemoRefer to Attachment B
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Tech Memo
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Tech Memo
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Tech MemoScope of the TMP (page 2-24)
– Minimal to complex projects– Short duration may not require a TMP– Basic TMP shall have provisions for a TTC plan
Plans, Specifications, and Estimates (PS&Es)– Include appropriate provisions of the TMP– Pay Items– Responsible persons
Project TTC Field Observations– Drive through reviews– Revisions to TTC plans 41
Page 2-24
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Planning for TTC
Oversize/Overweight Vehicles– Oversize/overweight (OSOW) vehicles
need to be considered– May be difficult or impossible for OSOW
vehicles to navigate the work zone– Contact the permits department
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Page 2-39
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Planning for TTC
Lane Width– In some TTC areas, reduced lane
widths are used to maintain the number of lanes
– Important to communicate with all interested departments
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Planning for TTC
Speed Limits in Work Zones– MN Statutes 169.14, Subd. 5d went
into effect August 1, 2014– Modified speed limits and fines in work
zones
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Source: Ken Johnson
Presentation
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Planning for TTC
Speed Limits in Work Zones– Speed limit in work zone when workers
present• The speed limit on a road having an
established speed limit of 50 mph or greater is adjusted to 45 mph in a work zone (remember definition) when…
• At least one lane or portion of a lane of traffic is closed in either direction
• Workers are present• Exceptions follow -
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Planning for TTC
Workers Present Speed Limit– The required work zone speed limit of
45 mph does not apply when…• Positive barriers are placed between
workers and the traveled portion of the highway
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Planning for TTC
Workers Present Speed Limit– The required work zone speed limit of
45 mph does not apply when…• The work zone is in place for less than 24
hours
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Planning for TTC
Workers Present Speed Limit– The required work zone speed limit of 45
mph does not apply when…– “A different speed limit for the work zone is
determined by the road authority following an engineering and traffic investigation, and based on accepted engineering practice”
– 24/7 construction speed limit • Commissioners Order required• Start with District Traffic, needs CO
approval
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Planning for TTC
Workers Present Speed Limit– The required work zone speed limit of 45
mph does not apply when…• A reduced speed limit for the work zone is
established by the road authority for a road under their jurisdiction when workers are present (an engineering and traffic investigation is not required)
– No more than 20 mph on a street or highway with an established speed limit of 55 mph or greater
– No more than 15 mph on a street or highway with an established speed limit of 50 mph or less
– The “Other” Workers Present Speed Limit• or agency determined (see upcoming slide)
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Planning for TTC
Workers Present Speed Limit– The required work zone
speed limit of 45 mph does not apply when…• Added in the proposed
revision to the MN MUTCD
• On the roadway of a divided highway with a median that does not include a TTC zone
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Planning for TTC
Agency Determined Workers Present Speed Limit– Only requires:
• In Work Zone• Workers Present• Determined by DTE or designee
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Planning for TTC
What Projects May be Affected?– Types of projects that may be affected
by this new law – required reduction• Pavement rehabilitation (reclaim and
overlay, mill and overlay, overlay, chip seals, micro surfaces)
• Pavement patching and crack sealing• Reconstruction projects• Multi-day culvert replacement (at one
location)• Bridge construction/repair• Installation of an intersection traffic
control device (e.g. traffic signal or roundabout)
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TEM 8-4.00
8-4.01 Temporary Traffic Control Goals– Strive for the greatest payoff in terms
of safety and convenience– What is the likelihood of motorists
failing to negotiate the work zone safely?
– What are the consequences of such action on pedestrians, workers, or other motorists?
– Goals• to minimize crashes and crash severity;
and• to minimize inconvenience and conflicts as
a result of the work
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Page 2-41
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TEM 8-4.00
8-4.02 Traffic Management and Temporary Traffic Control Plan– Purpose of the TMP– Scope of the TMP– Temporary Traffic Control Plan– Responsibility– Preliminary Design– Detail Design– Construction
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Page 2-39 through
Page 2-44
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TEM Appendix 8-10.01
Traffic Management Plan Checklist
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Page 2-45
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TEM Appendix 8-10.01
Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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Traffic Management Plan Checklist
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TMP Development
TMP Development Tips– Start early
• TMP development should start as early in the project development process as possible so that TMP strategies can be accounted for in the budgeting/scoping process
– Coordinate early• Effective TMP is one that has input from all of the
key players in the project development process • Ensure all are involved from the start of TMP
development
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TMP Development
TMP Development Tips– Use templates, guidance and other tools
• Templates, guidance, and other standardized agency resources help ensure that TMPs within an agency are consistent
• These tools also simplify TMP development by helping those developing TMPs understand what is expected for agency TMPs
– Provide TMP Training• Helps ensure consistent TMPs• Also helps personnel understand why TMPs are
important• Helps gain management buy-in for TMPs, as
management support is needed for effective TMP efforts
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TMP Development
TMP Development Tips– Assess, Monitor and Update the TMP
• Include funding for monitoring traffic conditions during construction to track TMP effectiveness
• Can be a challenge because it requires additional time beyond just developing the TMP
• Monitoring and updating the TMP as the project progresses or new potential impacts are discovered is important to ensuring the TMP remains effective at increasing work zone safety and mobility
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TMP Development
TMP Development Tips– Document everything
• TMP becomes a written history of the project• If design and development decisions are well
documented, time, energy and money can be saved in the development of the project, as well as future projects
• A brief standardized report at the completion of major projects that describes the TMP development and implementation process and outcomes can be very beneficial to future projects
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TMP Development
TMP Development Tips– Understand diversion rates
• Accurate estimates of diversion rates can be useful• Some people will divert to an alternate route• This reduction in demand may make a broader
range of construction and MOT options feasible, possibly reducing project or TMP cost
– Facilitate use of alterative routes• Look into the feasibility of alternate routes early in
the TMP process• If improvements are needed to alternate routes,
schedule that work at least a year prior to the project so that the alternate routes can be ready for use once the project begins
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TMP Development
TMP Development Tips– Use strategies that keep lanes open
• Some examples are imposing damages for late lane opening; contract incentives/disincentives; narrowing lane widths or occasionally using shoulders during peak periods to maintain the number of lanes; night work
– Consider using extended closures vs. full closures vs. numerous night closures• Extended and full closures can greatly reduce
overall construction time and in many studies, it has been found that the public prefers one long-term closure to numerous smaller closures because the work can be completed sooner
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Pedestrian Treatments
Background– ADA of 1990– Adoption of PROWAG– Tech Memo 10-02-TR-01
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Tech Memo 12-03-T-02
Introduction– Ped facilities required on public ROW
for disabledPurpose
– Planning and design guidance for accessible ped facilities
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Tech Memo 12-03-T-02
Guidelines– Scoping– New construction and reconstruction– Alteration Projects– Preventative maintenance projects– Historical Properties– Accessibility during construction
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Page 2-55 and Page
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Checklist for Peds in TTC
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Checklist for Peds in TTC
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Checklist for Peds in TTC
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Checklist for Peds in TTC
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End of Chapter 2
Questions?