Work Zone - 2.02 Temporary Traffic Control Plan (TTCP)
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2.02 Temporary Traffic Control Plan (TTCP)
A TTCP is required for all projects and contains maintenance of traffic information. The TTCP must include, maintaining traffic plans, details, special provisions, and contract documents (i.e. notice to bidder, progress clause, coordination clause, etc.). The Special Provision that describes the construction staging for the project is commonly called The Special Provision for Maintaining Traffic.
Items to include in the TTCP vary by project phase, mobility impact and are summarized in Appendix A Project Development Process.
2.02.01 Maintaining Traffic Typicals
The TTCP must include or reference all applicable maintaining traffic typical plans. The typical sections vary by work zone type and location. MDOT Work Zone Typicals may be found at:
- Maintaining Traffic Typicals
- Michigan Manual of Uniform Traffic Control Devices (MMUTCD Part 6)
Work zones may require further development of sample typical plans to address all project features. Plan sheets to cover these situations should be developed.
Work zones for construction, maintenance operations and other permitted activities should be implemented in the same manner for consistency.
2.02.02 Detour Routes
Detours and potential alternate routes during construction should be identified in the TTCP. Metropolitan Planning Organization (MPO) or Bureau of Transportation Planning (BTP) statewide travel demand models can be used for corridor and network level impact assessment, to identify potential alternate routes, and assess detour options.
To identify potential detours and alternate routes, Region TSC staff are responsible for project coordination discussions with other transportation agencies in the vicinity of the proposed MDOT project.
If detours and alternate routes are necessary on non-MDOT roadways, discussions with affected local road agencies must occur to verify routes are capable of accommodating additional traffic volumes. Additional detour route design information and requirements are provided in Section 6.04 Detours and Alternate Routes.
2.02.03 Multi-Modal Considerations
Potential Transit, motorized, non-motorized and shared-use facility conflicts during construction should be anticipated and addressed in the TTCP. Construction activity conflicts should be reviewed, documented and mitigated in the TTCP. The TTCP should provide reasonably safe, convenient, and traversable paths that replicate, as practical, the most desirable characteristics of the existing facilities.
Transit drop-off / pick-up locations and activities must be addressed with the transit agency which may include a temporary site relocation.
Additional information and items to consider when developing the TTCP for pedestrians and bicycles are provided in:
- Chapter 5: Non-Motorized Work Zone Safety and Mobility
- Appendix A-Project Development Process
2.02.04 Special Provision for Maintaining Traffic
(Updated 12/3/2020)
Project specific traffic restrictions and a suggested sequence of operations for traffic control should be provided in the special provision.
The Special Provision for Maintaining Traffic defines the TTCP for the Contractor, and may include:
- Detailed construction staging
- Maintaining traffic restrictions
- Project work
- Traffic control devices
- Construction influence area
- Temporary signing and pavement marking
- Measurement and payment of traffic items
- Estimate of temporary traffic control quantities
Work zone safety and mobility is heavily impacted during the commencement of traffic pattern modifications and the initial placement of temporary traffic control devices. These operations are extremely critical for overall work zone safety. Additional planning should be considered and documented in the TTCP.
Project staff should document which days of the week and times of the day, are the most conducive to altering or changing traffic patterns. This may reduce the impact of the initial traffic control changes and increase work zone safety.
It is the Contractor’s responsibility to perform the construction activities and maintain traffic for the project according to the Special Provision for Maintaining Traffic and the Maintenance of Traffic (MOT) plans, unless otherwise approved by MDOT. Worker and motorist safety must be addressed when developing a plan to modify traffic conditions.
A. Boilerplate Document
(Added 12/3/2020) ADD LINKS HERE
The MOT boilerplate, which is a template document for the creation of MOT Special Provisions, can be found here in Projectwise. The instructions for the document can be found here in the same folder. The MOT boilerplate is intended as a tool for engineers to use to help design MOTs on their projects and work towards consistency on a statewide level. The boilerplate language is to be edited so that only project-relevant language is used.
2.02.05 Preliminary MOT Cost Estimate
Cost estimates should be provided for alternative MOT options investigated as part of the TMP. These figures may justify the selection of the appropriate MOT. The scope and complexity of a project will dictate the level of detail needed in the estimating of alternatives.
Region Engineer notification is required if estimated maintaining traffic costs exceed 25% of the total project cost.
2.02.06 Internal Traffic Control Plan (ITCP)
(Updated 12/3/2020)
The objective of the ITCP is to provide a safe traffic pattern and access plan for the contractor, equipment and materials, improving the overall safety of the work zone.
The ITCP is developed by the Contractor prior to beginning work on the project as detailed in the Special Provision for Maintaining Traffic and in the Standard Specifications for Construction, section 104.11B. The ITCP is a contract document and its development must incorporate all project specific requirements and restrictions found in the MOT SP.
The MOT will require either a Type A or Type B ITCP. Type A ITCPs should include the following information:
- Proposes ingress and egress locations for construction equipment and vehicles.
- Details Traffic control devices to warn the motoring public of ingress / egress locations.
- Outlines methods to ensure compliance with ITCP.
- Minimizes conflicts between construction vehicles and motorists and maintains overall safety.
- ITCP submitted at the preconstruction meeting.
Type B ITCPs should meet the following requirements:
- Proposes ingress and egress locations for construction equipment and vehicles.
- Details Traffic control devices to warn the motoring public of ingress / egress locations.
- Outlines methods to ensure compliance with ITCP.
- Minimizes conflicts between construction vehicles and motorists and maintains overall safety.
- Must include a minimum 600 foot acceleration and deceleration areas with a paved surface for ingress and egress locations.
- Includes a hauling schedule, that stays within the listed hauling restrictions.
- The ITCP submitted at least 14 days prior to all stage changes or major changes in traffic pattern.
A. Review
The Contractor must develop and submit for review an ITCP in accordance with the MOT to reduce conflicts within the work zone.
A plan for further communication of the provisions of the ITCP and the overall construction safety plan must be discussed at the pre-construction meeting. This includes briefing truck drivers on the following points:
- Accessing the project site
- Path to follow while traveling within the site
- Where to stop for staging
- How a spotter will instruct them when working near other equipment
- Procedures for leaving the project area and re-entering traffic
B. Construction
The ITCP should be reviewed and updated on a regular basis at project safety meetings throughout the life of the project. The updated ITCP should be distributed to all personnel working on the project, including inspectors and all sub-contractors.
The prime contractor, safety officer or designated person for each work shift is responsible for monitoring and correcting noncompliant behavior.
2.02.07 Incentives / Disincentives (I/D)
I/D clauses may be used for a multitude of reasons not related to user delay. If the focus of use is user delay related, the I/D amount should be based on user delay costs.
The Mobility Analysis tools may be used to determine if an I/D clause is warranted. If warranted the tools can be used to estimate user costs.
The contract I/D should be included in the Progress Clause and should be noted in the TMP.
2.02.08 Temporary Traffic Control Plan Strategies (TTCP)
(Updated 5/28/2021)
The following TTCP strategies may be useful for mitigating impacts on construction projects. They include strategies for use in the following categories:
- Operations
- Work Restrictions
- Contracting Methods
- Coordination
- Traffic Control
Large complex projects may incorporate a number of these strategies. Options listed below should be considered by project offices and engineering judgement should be utilized when determining appropriate strategies. If applicable these options should be considered and referenced when documenting a deviation from the MDOT Decision Tree process as detailed in 1.02.08.
2.02.09 Alternatives Analysis
As part of the scoping and Call for Projects process, the proposed project work types’ and corresponding construction alternatives should be analyzed and evaluated to determine the recommended scope of work for the project. Each work type and construction alternative will require a review of the appropriate TTCP, taking into consideration existing operational factors within the project limits.
The Associate Region Development Engineer approves the proposed work type. The construction alternatives including the approved project concept should be analyzed to determine the impact of the project on the existing roadway and adjacent corridors. Compare the results of the analysis with the existing conditions for use in the development of the TTCP.
On larger projects having a public survey to determine which method the locals would prefer is also an effective option. Public buy-in may allow for a more aggressive schedule, larger areas closed, but less construction time. If there are two equivalent methods, the public opinion is an item that can be used to make a final selection.
The alternative analysis should consider including the items summarized in Section 2.03.01 Work Zone Mobility Analysis.
Exhibit 2-1: Temporary Traffic Control Plan Strategies: Operations
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Exhibit 2-2: Temporary Traffic Control Plan Strategies: Work Restrictions
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Exhibit 2-3: Temporary Traffic Control Plan Strategies: Contracting Methods
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Exhibit 2-4: Temporary Traffic Control Plan Strategies: Coordination
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Exhibit 2-5: Temporary Traffic Control Plan Strategies: Traffic Control
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