This section contains diagrams which depict typical TTC zones. The diagrams include all the requirements for the type of closure shown. Some diagrams also include devices which are recommended or are optional. It should be noted that the diagrams are typical and that construction procedures may require that two or more typical diagrams be used in one area of construction. Channelizing devices associated with these typical diagrams shall be moved, supplemented, changed, or removed as required to ensure that the motorist does not receive false information.

If a project requires that typical diagrams be combined or altered numerous times throughout the duration of the project, it is recommended that a site-specific TTC plan be prepared for the project following the standards presented in the previous sections of this handbook, and in compliance with the MUTCD, for review and comments by CDOT before commencing work.

The standards presented in the previous sections of this handbook and the diagrams, which follow, are the minimum required. Additional signs, cones, barricades, and warning devices may be used, but at no time will less than what is specified herein be acceptable. Since public safety is involved, a high degree of conformity to the presented standards is necessary. Other traffic control devices or applications may be used, but only with the approval of the CDOT.

** Old Section 19 renumbered to Section 20 - 8/17/2009

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