MOT Work Zone Planning & Design Principles 5 — Questions and Answers
Question 1: During the planning phase of a work zone, a road safety audit (RSA) is best described as:
- A financial review of construction costs
- A formal examination of a proposed work zone plan to identify safety issues before implementation (Correct answer)
- An inspection performed only after the work zone is removed
- A driver survey about preferences for lane configurations
Correct answer: A formal examination of a proposed work zone plan to identify safety issues before implementation
A Road Safety Audit is a formal, proactive review of the TTC plan by an independent team to identify and correct safety deficiencies before the work zone opens to traffic.
Question 2: On an Interstate highway work zone, what is the required minimum clearance between the edge of the nearest open travel lane and stationary workers or equipment?
- 2 feet
- 3 feet
- 10 feet
- It varies based on traffic volume and speed (Correct answer)
Correct answer: It varies based on traffic volume and speed
The required clearance between open travel lanes and stationary workers/equipment varies and is specified in the project's TTC plan based on traffic speed, volume, and site conditions.
Question 3: Which of the following is a key reason for conducting a traffic study before designing a work zone on a heavily traveled urban arterial?
- To determine the color of cones to use
- To understand peak traffic volumes and identify the least disruptive times for lane closures (Correct answer)
- To calculate the number of flaggers needed for nighttime only
- To satisfy a requirement for purchasing construction insurance
Correct answer: To understand peak traffic volumes and identify the least disruptive times for lane closures
A pre-construction traffic study reveals peak periods and volume patterns, enabling planners to schedule lane closures during off-peak times to minimize congestion and safety risks.
Question 4: What is the purpose of the 'work space' within the activity area of a work zone?
- To provide a lane for slow-moving construction vehicles to travel
- To contain all workers, equipment, and materials needed for the construction activity (Correct answer)
- To store warning signs when not in use
- To serve as an emergency vehicle bypass route
Correct answer: To contain all workers, equipment, and materials needed for the construction activity
The work space is the portion of the activity area exclusively reserved for construction workers, equipment, and materials, kept physically separated from moving traffic.
Question 5: When a work zone requires contraflow operations (reversing the normal direction of travel in a lane), what is a critical design element that must be included?
- Higher-than-normal speed limits in the contraflow lane
- Positive separation barriers between opposing traffic streams (Correct answer)
- Elimination of all advance warning signs to reduce driver confusion
- Open shoulders for emergency parking only
Correct answer: Positive separation barriers between opposing traffic streams
Contraflow operations require positive separation (such as temporary concrete barriers or water-filled barriers) between opposing traffic flows to prevent head-on collisions.
Question 6: According to work zone design best practices, which of the following should be considered when selecting the type of channelizing devices for a high-speed freeway work zone?
- Devices should be as lightweight as possible to make removal easy
- Devices should meet crashworthiness standards and have adequate retroreflectivity for nighttime visibility (Correct answer)
- The cheapest available device should always be used to stay within budget
- Devices should be removed during active work hours and replaced overnight
Correct answer: Devices should meet crashworthiness standards and have adequate retroreflectivity for nighttime visibility
Channelizing devices on high-speed freeways must meet MASH or NCHRP 350 crashworthiness standards and provide adequate retroreflectivity so they are visible to drivers day and night.
Question 7: A 'typical application' (TA) diagram in the MUTCD refers to:
- A billing document for traffic control equipment rental
- A standardized illustration showing the recommended layout of signs, devices, and markings for a specific work zone situation (Correct answer)
- A photograph of a completed work zone for reference purposes
- A checklist for flagger certification requirements
Correct answer: A standardized illustration showing the recommended layout of signs, devices, and markings for a specific work zone situation
Typical Application (TA) diagrams in Part 6 of the MUTCD provide standardized layout illustrations that serve as templates for designing work zone traffic control for common situations.
MOT Work Zone Planning & Design Principles 5
During the planning phase of a work zone, a road safety audit (RSA) is best described as: