MOT Temporary Traffic Control Plans 4 — Questions and Answers
Question 1: A TTC plan for a multi-lane highway requires a crossover for construction traffic. What is the primary concern when designing this crossover?
- Maximizing construction vehicle speed through the crossover
- Ensuring adequate sight distance and geometric design to prevent conflicts (Correct answer)
- Minimizing the number of signs required
- Locating it as close to the work area as possible to save space
Correct answer: Ensuring adequate sight distance and geometric design to prevent conflicts
Crossover design must provide adequate sight distance and safe geometry to prevent vehicle conflicts between construction and public traffic.
Question 2: What is the primary purpose of a 'termination area' in a TTC zone layout?
- To warn drivers that the work zone is ending and guide them back to normal lanes (Correct answer)
- To store surplus traffic control devices at the end of the shift
- To mark where all lane closures must begin
- To provide a staging area for equipment storage
Correct answer: To warn drivers that the work zone is ending and guide them back to normal lanes
The termination area transitions traffic from the restricted work zone back to normal lane use at the downstream end.
Question 3: Under MUTCD Part 6, what is the recommended advance warning sign spacing for a 55 mph road in a rural area?
- 100 feet between each sign
- 250 feet between each sign
- 500 feet between each sign (Correct answer)
- 1,500 feet between each sign
Correct answer: 500 feet between each sign
MUTCD Table 6C-1 recommends advance warning sign spacing of approximately 500 feet for 55 mph rural roadways.
Question 4: A TTC plan includes portable temporary traffic signals. Which condition MUST be planned for in case of signal malfunction?
- A backup generator only
- A contingency plan such as flagger control to replace the failed signal (Correct answer)
- Immediate suspension of all work activity
- Automatic reversion to flashing red on all approaches
Correct answer: A contingency plan such as flagger control to replace the failed signal
TTC plans using temporary signals must include a contingency for signal failure, typically flagger control to maintain safe traffic flow.
Question 5: What information is NOT typically required on a formal TTC plan drawing?
- North arrow and scale
- Contractor's payroll records (Correct answer)
- Dimensions of tapers and buffer spaces
- Sign legend and device inventory list
Correct answer: Contractor's payroll records
Payroll records are a contract compliance document unrelated to TTC plan content; the plan focuses on traffic control layout and devices.
Question 6: Which of the following best describes a 'mobile operation' TTC plan scenario?
- A lane closure that remains in one location for an entire week
- A work operation that moves continuously or intermittently, such as pavement striping (Correct answer)
- A temporary detour that is in place for the entire project duration
- A nighttime-only closure that is set up and taken down each day
Correct answer: A work operation that moves continuously or intermittently, such as pavement striping
Mobile operations involve work that moves progressively along the roadway, such as pavement marking, requiring a moving TTC setup.
Question 7: When a TTC plan requires pedestrian accommodations, what is the minimum acceptable alternative pedestrian path width according to ADA guidelines?
- 2 feet
- 4 feet (Correct answer)
- 6 feet
- 8 feet
Correct answer: 4 feet
ADA requires a minimum 4-foot-wide accessible pedestrian route when existing walkways are blocked by work zones.
MOT Temporary Traffic Control Plans 4
A TTC plan for a multi-lane highway requires a crossover for construction traffic.
What is the primary concern when designing this crossover?