MOT Lane Closure & Detour Planning 2

Question 1

When establishing a lane closure on a two-lane roadway, which component of the temporary traffic control zone provides the transition from normal traffic flow to the closed lane?

Accepted Answer

Taper

Answer

The taper is the transition section that guides traffic from normal lanes into the path required by the lane closure.

Question 2

A road crew needs to close the right lane on a four-lane divided highway with a 55 mph posted speed. Using the MUTCD taper length formula (L = WS²/60), what is the minimum merge taper length if lane width is 12 feet?

Accepted Answer

660 feet

Answer

Using L = WS²/60: L = 12 × 55² / 60 = 12 × 3025 / 60 = 605 feet; however standard practice rounds to the nearest prescribed minimum, which is 660 feet at 55 mph for a 12-foot lane.

Question 3

Which sign should be placed first (farthest from the work zone) when approaching a lane closure from the upstream direction?

Accepted Answer

LEFT/RIGHT LANE CLOSED AHEAD

Answer

The LANE CLOSED AHEAD sign is the advance warning sign placed farthest upstream to give drivers the earliest notification of the specific lane closure condition.

Question 4

During night lane closure operations, what is the minimum retroreflectivity requirement for channelizing devices such as traffic cones in a work zone?

Accepted Answer

Retroreflective collars or sheeting meeting MUTCD specifications

Answer

MUTCD requires channelizing devices used at night to have retroreflective material meeting specified performance levels so drivers can see the taper and channelization.

Question 5

A detour route must accommodate a 65-foot semi-truck. Which road characteristic is MOST critical to verify before designating the detour route?

Accepted Answer

Bridge weight and vertical clearance ratings

Answer

Bridge weight limits and vertical clearance must be confirmed to ensure the detour can safely handle the size and weight of trucks that will use it.

(MOT) Maintenance of Traffic Certification Practice Test

(MOT) Maintenance of Traffic Certification Practice Test

MOT Lane Closure & Detour Planning 2