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Questions and Answers
A reduction in speed of this amount requires signage in a TTC zone.
A reduction in speed of this amount requires signage in a TTC zone.
10 mph
What are the four areas of a TTC zone?
What are the four areas of a TTC zone?
Advance warning area, transition area, activity area, and termination area
What are the three types of spaces within the activity area?
What are the three types of spaces within the activity area?
Buffer space, traffic space, and work space
What type of vehicle can guide drivers through a TTC zone?
What type of vehicle can guide drivers through a TTC zone?
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What vehicle provides improved visibility for workers in the TTC zone?
What vehicle provides improved visibility for workers in the TTC zone?
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Stop/slow paddles are this shape.
Stop/slow paddles are this shape.
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Flags are this color at night.
Flags are this color at night.
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Flashing lights should flash at this rate interval.
Flashing lights should flash at this rate interval.
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AFAD's should only be used when there are this many lanes on an approach.
AFAD's should only be used when there are this many lanes on an approach.
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The length of retroreflectivity tape on gate arms.
The length of retroreflectivity tape on gate arms.
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Grade Crossing Advance Warning Sign in a TTC zone has this color scheme.
Grade Crossing Advance Warning Sign in a TTC zone has this color scheme.
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Minimum height of signs above sidewalks.
Minimum height of signs above sidewalks.
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The shape of TTC warning signs.
The shape of TTC warning signs.
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All arrow boards should be able to dim to this percent of full brightness.
All arrow boards should be able to dim to this percent of full brightness.
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Flashing rate of arrow boards.
Flashing rate of arrow boards.
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Drums have these minimum dimensions.
Drums have these minimum dimensions.
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These are the two types of crash cushions.
These are the two types of crash cushions.
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Long-term stationary work lasts for this amount of time.
Long-term stationary work lasts for this amount of time.
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Short-term stationary works is at least this amount of time.
Short-term stationary works is at least this amount of time.
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Length of time for a minor traffic incident.
Length of time for a minor traffic incident.
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Length of time for a major traffic incident.
Length of time for a major traffic incident.
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These describe TTC measures to be used for facilitating road users through a work zone or an incident area.
These describe TTC measures to be used for facilitating road users through a work zone or an incident area.
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This is an area of a highway where road users' conditions are changed because of a work zone, an incident zone, or a planned special event.
This is an area of a highway where road users' conditions are changed because of a work zone, an incident zone, or a planned special event.
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This is an area of a highway with construction, maintenance, or utility work activities.
This is an area of a highway with construction, maintenance, or utility work activities.
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This is an area of a highway where temporary traffic controls are imposed by authorized officials in response to a traffic incident.
This is an area of a highway where temporary traffic controls are imposed by authorized officials in response to a traffic incident.
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This is the section of highway where road users are informed about the upcoming work zone or incident area.
This is the section of highway where road users are informed about the upcoming work zone or incident area.
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This is the section of highway where road users are redirected out of their normal path.
This is the section of highway where road users are redirected out of their normal path.
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This is the section of the highway where the work activity takes place.
This is the section of the highway where the work activity takes place.
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This is that portion of the highway closed to road users and set aside for workers, equipment, and material, and a shadow vehicle if one is used upstream.
This is that portion of the highway closed to road users and set aside for workers, equipment, and material, and a shadow vehicle if one is used upstream.
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This is the portion of the highway in which road users are routed through the activity area.
This is the portion of the highway in which road users are routed through the activity area.
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This is a lateral and/or longitudinal area that separates road user flow from the work space or an unsafe area, and might provide some recovery space for an errant vehicle.
This is a lateral and/or longitudinal area that separates road user flow from the work space or an unsafe area, and might provide some recovery space for an errant vehicle.
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This is the section of the highway where road users are returned to their normal driving path.
This is the section of the highway where road users are returned to their normal driving path.
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This kind of taper requires the longest distance.
This kind of taper requires the longest distance.
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This is a temporary rerouting of road users onto an existing highway in order to avoid a TTC zone.
This is a temporary rerouting of road users onto an existing highway in order to avoid a TTC zone.
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Study Notes
Traffic Control (TTC) Zones
- A reduction in speed of 10 mph necessitates signage in a TTC zone.
- Four areas define a TTC zone: advance warning area, transition area, activity area, and termination area.
Activity Area Spaces
- Three types of spaces are present: buffer space, traffic space, and work space.
Vehicle Guidance in TTC Zones
- A pilot car is essential for guiding drivers through a TTC zone.
- A shadow vehicle enhances visibility for workers within the TTC zone.
Signage and Visibility
- Stop/slow paddles are octagonal in shape.
- Flags at night must be retroreflectorized red for visibility.
- Flashing lights in work zones should flash at a rate of 50-60 times per minute.
Traffic Control Devices
- Automatic Flagger Assistance Devices (AFADs) are only appropriate for single-lane approaches.
- Retroreflectivity tape on gate arms measures 16 inches in length.
- Grade Crossing Advance Warning Signs use a color scheme of black legend and border on a yellow background.
Sign Heights and Shapes
- Minimum sign height above sidewalks is 7 feet; it's 5 feet in rural areas without sidewalks.
- TTC warning signs have a diamond shape.
Arrow Boards and Drums
- All arrow boards should be able to dim to 50% of full brightness.
- The flashing rate for arrow boards is 25-40 flashes per minute.
- Drums used for traffic control must have a minimum diameter of 18 inches and height of 36 inches.
Crash Cushions
- Two types of crash cushions exist: stationary crash cushions and truck-mounted attenuators.
Work Duration
- Long-term stationary work lasts at least 3 days.
- Short-term stationary work must last a minimum of 1 hour.
- Minor traffic incidents are defined as those lasting up to 30 minutes.
- Major traffic incidents last around 2 hours.
TTC Plans and Zones
- TTC plans outline the measures for facilitating user movement through work zones or incident areas.
- A TTC zone represents an area where conditions change due to work, incidents, or events.
- Work zones are specific areas with construction, maintenance, or utility activities.
- Incident zones are areas with temporary traffic controls due to accidents.
Transitioning Through TTC Zones
- The advance warning area informs road users of upcoming work or incidents.
- A transition area redirects road users away from their usual path.
- Activity areas are where actual work takes place.
- Work spaces are reserved for personnel, equipment, and material, including shadow vehicles.
- Traffic spaces route users through the active work area.
- Buffer spaces provide separation between road users and work areas, offering recovery space if needed.
- Termination areas return road users to their normal driving paths.
Tapers and Detours
- Merging tapers require the longest distance for safe transitions.
- Detours re-route users onto existing highways to avoid TTC zones.
Studying That Suits You
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Description
Test your knowledge on the key concepts of the MUTCD Chapter 6. This quiz covers important terms and definitions related to temporary traffic control zones, including speed reductions and the various areas of a TTC zone. Perfect for traffic management students and professionals.
