MOT Traffic Control Devices & Placement Standards 4

Question 1

According to MUTCD, what is the correct action when a flagger cannot be seen by an approaching driver due to a curve or hill?

Accepted Answer

Post an additional flagger or a high-intensity warning light at the hidden location

Answer

When sight distance is limited, an additional flagger or automated flagger assistance device must be placed in advance to warn approaching traffic.

Question 2

In a temporary traffic control zone, vertical panels are typically used to:

Accepted Answer

Delineate the edge of a travelled way at night or in low-visibility conditions

Answer

Vertical panels are primarily used to delineate the edge of the travelled way, especially at night or in low visibility, due to their retroreflective strips.

Question 3

What does the 'W' designation in a sign code such as W20-1 indicate?

Accepted Answer

Warning

Answer

In MUTCD sign codes, 'W' stands for Warning, and W20 series signs are specifically warning signs related to highway work zones.

Question 4

Under what condition is it acceptable to use painted edge lines alone as the only TTC measure in a short-duration work zone?

Accepted Answer

When the work activity is fully within the shoulder and no workers are in the roadway

Answer

If work is confined entirely within the shoulder with no workers in the travel lane, edge lines alone may be sufficient for very short-duration operations.

Question 5

Which factor most directly determines the required taper length (L) for a merging taper?

Accepted Answer

Speed limit and the width of the lane being closed

Answer

Taper length L is calculated using the formula L = WS (width × speed) or L = WS²/60 depending on speed, so speed limit and lane width are the primary factors.

(MOT) Maintenance of Traffic Certification Practice Test

(MOT) Maintenance of Traffic Certification Practice Test

MOT Traffic Control Devices & Placement Standards 4