Notes on Chapter 6C - MUTCD 2009 Edition

Section 6C.01 Temporary Traffic Control Plans

• Purpose of TTC Plans: Facilitate road users through work zones or incident areas, ensuring continuity of road user flow.
• Scope: From detailed plans to references in standard drawings.
• Preparation: Should be done by knowledgeable individuals; based on engineering judgment.
• Coordination: Necessary between adjacent projects to prevent duplicate signage.
• Accessibility: Must include provisions for accessible paths for pedestrians and transit services.
• Modifications: Allowed for better safety/effectiveness, with agency approval.

Section 6C.02 Temporary Traffic Control Zones

• Definition: Area of highway with altered conditions due to work, incidents, or events.
• Components:
  • Work Zone: Marked by signs, barriers, etc.
  • Incident Zone: Temporary controls in response to incidents.
  • Planned Events: Traffic patterns altered for event management.

Section 6C.03 Components of Temporary Traffic Control Zones

• Division into Areas:
  • Advance Warning Area
  • Transition Area
  • Activity Area
  • Termination Area

Section 6C.04 Advance Warning Area

• Purpose: Inform users of upcoming work zones or incidents.
• Sign Placement: Varies based on road type and speed limits.
• Table 6C-1: Outlines recommended spacing for warning signs.

Section 6C.05 Transition Area

• Purpose: Redirect users from their normal path using tapers or vehicle-mounted devices.

Section 6C.06 Activity Area

• Purpose: Area where work occurs, including work, traffic, and buffer spaces.
• Buffer Spaces: Should not be used for work or storage.

Section 6C.07 Termination Area

• Purpose: Return users to their normal path. May use END ROAD WORK signs or speed limit signs.

Section 6C.08 Tapers

• Usage: In transition and termination areas, lengths depend on various factors.
• Taper Length Criteria: Provided in Tables 6C-3 and 6C-4.

Section 6C.09 Detours and Diversions

• Detours: Reroute users onto existing highways.
• Diversions: Reroute users onto temporary highways.

Section 6C.10 - 6C.15 One-Lane, Two-Way Traffic Control Methods

• Flagger Method: Typically used with flaggers at each end.
• Flag Transfer Method: Uses a flag or token to control traffic.
• Pilot Car Method: Guides traffic via a car.
• Traffic Control Signal Method: Uses signals to manage flow.
• Stop/Yield Control Method: For low-volume roads with good visibility.

Summary:

• Key Considerations: Safety, accessibility, and efficient traffic management in TTC zones.
• Engineering Judgement: Essential for planning and implementing TTC measures.