KDOT Guardrail, Barriers & Safety Appurtenances 3

Question 1

What is the definition of 'working width' for a longitudinal barrier system?

Accepted Answer

The maximum lateral displacement of the barrier system during a crash test impact

Answer

Working width is the maximum lateral displacement of the barrier system during a crash test impact, determining the minimum clearance needed behind the barrier to prevent a vehicle from reaching hazards beyond it.

Question 2

What inspection action should be taken immediately after a guardrail system has been struck by a vehicle during a construction project?

Accepted Answer

Document the damage and notify the KDOT project engineer for evaluation and repair authorization

Answer

After an impact, the inspector must document all damage and notify the KDOT project engineer, who will determine whether the system still provides adequate protection or requires repair before returning to service.

Question 3

What is the function of a breakaway base on sign posts and luminaire standards installed adjacent to the roadway?

Accepted Answer

To allow the post to separate from its foundation when struck, reducing injury risk to vehicle occupants

Answer

Breakaway bases are designed so that when struck by a vehicle, the post separates from its foundation, greatly reducing the deceleration forces applied to vehicle occupants during the impact.

Question 4

Under what primary condition does KDOT typically specify concrete median barrier (CMB) in place of W-beam guardrail for median protection?

Accepted Answer

When high traffic volumes and speeds make cross-median crashes potentially severe

Answer

Concrete median barriers are preferred in high-volume, high-speed corridors where cross-median incursions would result in severe crashes, as CMB provides positive vehicle containment with minimal deflection.

Question 5

How is guardrail installation typically measured for payment on KDOT projects?

Accepted Answer

Per linear foot of complete guardrail system

Answer

KDOT typically pays for guardrail installation on a per linear foot basis, which encompasses rail panels, posts, hardware, and specified end treatments as a complete installed system.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

KDOT Guardrail, Barriers & Safety Appurtenances 3