BCE Highway 5

Question 1

In highway drainage design, the rational method formula Q = CiA is used to estimate peak runoff. What does the variable 'i' represent?

Accepted Answer

Rainfall intensity in in/hr for the design storm duration

Answer

In Q = CiA, 'i' is the rainfall intensity (in/hr) corresponding to the time of concentration and return period from IDF curves.

Question 2

What is the purpose of a truck climbing lane on a steep uphill grade?

Accepted Answer

Allow slow-moving trucks to separate from faster passenger vehicles

Answer

Climbing lanes give slow trucks an auxiliary lane so that passenger vehicles can maintain speed, preventing capacity reduction on steep upgrades.

Question 3

Which AASHTO functional classification serves the highest traffic volumes and longest trip lengths in the US highway system?

Accepted Answer

Principal arterials (Interstates)

Answer

Principal arterials, especially the Interstate system, are at the top of the functional classification hierarchy, designed for maximum mobility and long-distance travel.

Question 4

What pavement design concept does 'resilient modulus' (Mr) represent for subgrade soils?

Accepted Answer

Elastic stiffness of soil under repeated dynamic loading

Answer

Resilient modulus measures the elastic (recoverable) stiffness of soil under repeated cyclic loads simulating traffic, and is the key subgrade input in mechanistic-empirical pavement design.

Question 5

In a signalized intersection, what is the 'lost time' per phase primarily associated with?

Accepted Answer

Start-up delay at the beginning plus clearance delay at the end of green

Answer

Lost time consists of start-up lost time (sluggish queue discharge at green) plus clearance lost time (unused green during yellow/red), totaling typically 3–4 seconds per phase.

BCE - Bachelor of Civil Engineering Practice Test

BCE - Bachelor of Civil Engineering Practice Test

BCE Highway 5