MOT Work Zone Planning & Design Principles 2 — Questions and Answers
Question 1: What is the primary purpose of a Temporary Traffic Control (TTC) plan in a work zone?
- To reduce project costs by minimizing equipment
- To provide a safe environment for workers and road users during construction (Correct answer)
- To increase the speed limit through the work zone
- To eliminate the need for flaggers
Correct answer: To provide a safe environment for workers and road users during construction
A TTC plan's primary purpose is to provide a safe environment for both workers and road users by guiding traffic through or around the work zone.
Question 2: According to MUTCD, which document provides the national standard for temporary traffic control in work zones?
- AASHTO Green Book
- Part 6 of the MUTCD (Correct answer)
- FHWA Design Manual
- OSHA 29 CFR 1926
Correct answer: Part 6 of the MUTCD
Part 6 of the Manual on Uniform Traffic Control Devices (MUTCD) establishes the national standards for temporary traffic control in highway and street work zones.
Question 3: When designing a work zone on a high-speed roadway (≥45 mph), what is typically required that may not be needed at lower speeds?
- Flaggers instead of signals
- Longer taper lengths and buffer spaces (Correct answer)
- Fewer channelizing devices
- No advance warning signs
Correct answer: Longer taper lengths and buffer spaces
Higher operating speeds require longer taper lengths and buffer spaces to give drivers adequate time to react and adjust to lane changes.
Question 4: What is a 'termination area' in a work zone?
- The section where the work zone ends and normal traffic flow resumes (Correct answer)
- The area where workers park their vehicles
- The zone where construction equipment is stored overnight
- The location of the first advance warning sign
Correct answer: The section where the work zone ends and normal traffic flow resumes
The termination area is the downstream end of the work zone where traffic transitions back to normal highway conditions.
Question 5: Which factor is MOST critical when determining the length of the advance warning area?
- The number of workers on site
- The posted speed limit and sight distance (Correct answer)
- The color of the warning signs used
- The time of day the work is performed
Correct answer: The posted speed limit and sight distance
The posted speed limit and available sight distance are the most critical factors because they determine how far in advance drivers must be warned to safely react.
Question 6: A 'longitudinal buffer space' in a work zone is designed to:
- Store construction materials between lanes
- Separate moving traffic from the work activity area (Correct answer)
- Mark the end of the construction zone
- Define where flaggers must stand
Correct answer: Separate moving traffic from the work activity area
A longitudinal buffer space provides a distance separation between moving traffic and the active work area to protect workers if a vehicle encroaches.
Question 7: When a work zone requires a lane closure on a two-lane, two-way road, what traffic control method is most commonly used to maintain traffic flow?
- Temporary traffic signals only
- One-lane, two-way traffic controlled by flaggers or a pilot car (Correct answer)
- Full road closure with a detour
- Median crossover for all traffic
Correct answer: One-lane, two-way traffic controlled by flaggers or a pilot car
On two-lane, two-way roads with a lane closure, one-lane two-way operation controlled by flaggers or a pilot car is the most common method to keep traffic moving safely.
MOT Work Zone Planning & Design Principles 2
What is the primary purpose of a Temporary Traffic Control (TTC) plan in a work zone?