Difference between revisions of "812 - Temporary Traffic Control for Construction Zone Operations"

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==[[#OVERHEAD SIGN COVERS|OVERHEAD SIGN COVERS]]==
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In accordance with Standard Specifications for Construction Section 812.03.D.2, Sign covers are to be installed on Type I signs and require the submittal of shop drawings by the Contractor. Sign covers should obscure conflicting information and provide guidance to motorists without the use of fastening devices bearing directly on the sheeting.  Two inches of air space shall be required between the cover and the sign face for overhead signs. A lightweight material must be approved for use as a cover. Any permanent sign with a cover applied directly to the sign substrate without 2” of air space shall be replaced at no cost to the department.
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An approved sign cover detail for [http://mdotwiki.state.mi.us/construction/images/8/8d/SignCover_Type_1.pdf Type 1 Signs] is pictured below. Examples of best practices and inadvisable practices can be seen in the photographs below.
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[[File:SignCover Type 1.jpg|center|600px|link=http://mdotwiki.state.mi.us/construction/images/8/8d/SignCover_Type_1.pdf]]
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===[[#Examples of Best Practice Sign Covers|Examples of Best Practice Sign Covers]]===
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Orange sign cover stands out against permanent sign. It is clear the exit is closed and evident which exit is open as enough identifying information is left intact.
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::[[File:Best Practice Sign Covers - 1.jpg|left|500px]]
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Orange sign cover stands out against permanent sign. It is clear which exit is closed and evident which exit is open as enough identifying information is left intact.
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::[[File:Best Practice Sign Covers - 2.jpg|left|500px]]
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Profile view of u-bar attached to extruded aluminum sign.
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::[[File:Best Practice Sign Covers - 3.jpg|left|500px]]
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::[[File:SignCover Type 1.jpg|left|500px|link=http://mdotwiki.state.mi.us/construction/images/8/8d/SignCover_Type_1.pdf]]
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===[[#Examples of Inadvisable Sign Covers|Examples of Inadvisable Sign Covers]]===
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Inadvisable because sign directly connected on reflective surface via adhesion.
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::[[File:Best Practice Sign Covers - 4.jpg|left|500px]]
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Inadvisable because sign is completely covered, adding excess weight and posing a hazard to motorists, giving no directional information for motorists to know which routes are closed.
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::[[File:Best Practice Sign Covers - 5.jpg|left|500px]]
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Inadvisable because gray/plywood sign cover does not stand out well against sign substrate and does not draw attention of the motorist.
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::[[File:Best Practice Sign Covers - 6.jpg|left|500px]]
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Inadvisable because road geometry only has two lanes, but arrows overhead indicate three.
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::[[File:Best Practice Sign Covers - 7.jpg|left|500px]]
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[[Category:Construction Manual]]
 
[[Category:Construction Manual]]

Revision as of 17:13, 28 July 2020

812
Temporary Traffic Control for Construction Zone Operations
2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 812


Contents

GENERAL

-Update in Progress-

Freeway Work Zone Design Guidance

MDOT has established the following guidance on lane and shoulder widths when designing a 3R/4R freeway work zone. Any alterations in the MOT during construction must take this into consideration along with consultation with Design and Traffic & Safety staff, prior to modification of the work zone design.

http://www.michigan.gov/documents/mdot/MDOT_IM14-10_475340_7.pdf

3R/4R freeway Projects should have a minimum 11 foot lane, and any shoulder next to an open ditch should be at least 2 feet paved with 1 foot aggregate to the hinge point. If the open ditch shoulder width is equal to or less than the above dimensions, delineation devices as detailed in SOA 2013-001 Work Zone Safety Tools for Narrow Shoulders must be utilized.

In addition, a 1 foot minimum, 2 foot optimal shy distance from the edge line to the temporary traffic control device should be maintained.


[top of page]


MATERIALS

-Reserved-

[top of page]


CONSTRUCTION

Solar Board Inspection Checklist

Form 1013S, Inspectors Checklist for Solar Boards, may be used when inspecting Lighted Arrow, Type B and C arrow boards on construction projects.

The requirements for Lighted Arrow, Type B and C are described in Subsection 922.06 of the Standard Specifications for Construction.

If the form is utilized, inspectors need to verify all the information listed on Form 1013S and attach the form to the respective Inspectors Daily Report.

The form is available on MDOT’s form webpage.

[top of page]


Traffic Control During Special Marking Construction

These procedures apply to annual pavement marking contracts and acceptable methods of traffic control during special pavement marking removal and installation at intersections.

The State/Industry Construction Zone Review Team and Michigan State Police determined that working outside of the marked traffic lane closure during a traffic signal’s red indication is an acceptable work method, provided the following:

  1. Construction is considered short duration, as defined by the current edition of the Michigan Manual on Uniform Traffic Control Devices, Section 6G.02.MMUTCD.pdf
  2. The contractor does not impede the flow of traffic beyond the existing traffic controls.
  3. The contractor works within the confines of the red indication only, is back in the closure or on the curb, and outside of the traveled way when the traffic signal changes to a green indication.

The use of hand signals is not permitted as a secondary measure of temporary traffic control when working outside of the established closure. The contractors are subject to the same rules and regulations as all other pedestrians when outside the closure during a red traffic signal indication.

If the contractor is found working in the open lane on a green traffic signal indication, the allowance of working in the open lane on a red traffic signal indication should be discontinued.

Construction staff should use the Special Provision for Maintaining Traffic to prohibit working during a red traffic signal indication for a particular location, locations, or corridors. Region and TSC wide restrictions that prohibit working on a red indication are not recommended.

[top of page]


MEASUREMENT AND PAYMENT

-Reserved-

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OVERHEAD SIGN COVERS

In accordance with Standard Specifications for Construction Section 812.03.D.2, Sign covers are to be installed on Type I signs and require the submittal of shop drawings by the Contractor. Sign covers should obscure conflicting information and provide guidance to motorists without the use of fastening devices bearing directly on the sheeting. Two inches of air space shall be required between the cover and the sign face for overhead signs. A lightweight material must be approved for use as a cover. Any permanent sign with a cover applied directly to the sign substrate without 2” of air space shall be replaced at no cost to the department.

An approved sign cover detail for Type 1 Signs is pictured below. Examples of best practices and inadvisable practices can be seen in the photographs below.

SignCover Type 1.jpg

[top of page]


Examples of Best Practice Sign Covers

Orange sign cover stands out against permanent sign. It is clear the exit is closed and evident which exit is open as enough identifying information is left intact.

Best Practice Sign Covers - 1.jpg















Orange sign cover stands out against permanent sign. It is clear which exit is closed and evident which exit is open as enough identifying information is left intact.

Best Practice Sign Covers - 2.jpg












Profile view of u-bar attached to extruded aluminum sign.

Best Practice Sign Covers - 3.jpg













SignCover Type 1.jpg































[top of page]


Examples of Inadvisable Sign Covers

Inadvisable because sign directly connected on reflective surface via adhesion.

Best Practice Sign Covers - 4.jpg















Inadvisable because sign is completely covered, adding excess weight and posing a hazard to motorists, giving no directional information for motorists to know which routes are closed.

Best Practice Sign Covers - 5.jpg














Inadvisable because gray/plywood sign cover does not stand out well against sign substrate and does not draw attention of the motorist.

Best Practice Sign Covers - 6.jpg




























Inadvisable because road geometry only has two lanes, but arrows overhead indicate three.

Best Practice Sign Covers - 7.jpg















[top of page]


Personal tools
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Variants
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Navigation
Division 2 - Earthwork
Division 3 - Base Courses
Division 4 - Drainage Features
Division 5 - HMA Pavements and Surface Treatments
Division 6 - PCC Pavement Mixtures
Division 7 - Structures
Division 8 - Incidental Construction
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