KDOT Traffic Signal & Signage Installation 5

Question 1

What is the minimum recommended luminance ratio between a traffic signal lens and its background during daylight?

Accepted Answer

10:1

Answer

A luminance ratio of at least 10:1 between the lit signal lens and its background is recommended to ensure adequate daytime visibility.

Question 2

A KDOT inspector observes that a newly installed overhead sign is tilted 8 degrees from vertical. What is the appropriate action?

Accepted Answer

Document and require correction before final acceptance

Answer

Signs must be installed plumb and level per specifications; deviations must be corrected before the inspector approves final acceptance.

Question 3

What is 'signal coordination' in the context of arterial traffic signal systems?

Accepted Answer

Linking signal controllers so vehicles traveling at a designated speed can encounter progressive green lights

Answer

Signal coordination times green phases on a corridor so vehicles traveling at the design speed experience a 'green wave,' improving arterial flow and reducing stops.

Question 4

Which MUTCD sign color combination is used for temporary traffic control (work zone) signs?

Accepted Answer

Black on orange

Answer

Temporary traffic control signs in work zones use black text and symbols on an orange background, distinguishing them from permanent signs.

Question 5

When setting signal timing, what does 'minimum green' refer to?

Accepted Answer

The shortest time the signal will remain green to allow stopped vehicles to begin moving

Answer

Minimum green is the shortest duration the controller will allow a green indication before yielding to a competing call, ensuring queued vehicles can begin moving.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

KDOT Traffic Signal & Signage Installation 5