MOT Nighttime Work Zone Operations 4

Question 1

Under MUTCD guidelines, what is the required minimum mounting height for overhead signs in a temporary nighttime work zone on a highway?

Accepted Answer

7 feet

Answer

Temporary signs on posts must have a minimum mounting height of 7 feet from the bottom of the sign to the ground surface to maintain clearance and visibility.

Question 2

What type of temporary traffic control zone lighting minimizes glare for approaching motorists while still illuminating the work area?

Accepted Answer

Low-mounted directional lights aimed parallel to traffic flow

Answer

Low-mounted directional lights aimed parallel to traffic and downward illuminate the work area while minimizing direct glare into approaching drivers' eyes.

Question 3

A driver approaches a nighttime work zone at 65 mph. Approximately how many feet does the vehicle travel per second?

Accepted Answer

95 feet per second

Answer

At 65 mph, a vehicle travels approximately 95 feet per second (65 × 1.467 = ~95.4 ft/s), emphasizing the need for long advance warning distances at night.

Question 4

When temporary concrete barrier (TCB) is used in a nighttime work zone, what additional treatment is typically required?

Accepted Answer

Retroreflective delineators mounted on top at regular intervals

Answer

Retroreflective delineators or tubular markers mounted on top of TCB at regular intervals (typically every 25–50 feet) improve nighttime visibility of the barrier.

Question 5

What is the recommended spacing for channelizing devices (cones or drums) during a nighttime taper on a 55 mph road?

Accepted Answer

40 feet

Answer

The recommended taper device spacing at night is reduced compared to daytime; for 55 mph roads, spacing of approximately 40 feet provides better guidance in low-visibility conditions.

(MOT) Maintenance of Traffic Certification Practice Test

(MOT) Maintenance of Traffic Certification Practice Test

MOT Nighttime Work Zone Operations 4