Highway Engineering Exam Prep Latest 2026
Questions and Correct Detailed Already Graded
A+
What is the AASHTO design value for the typical PIEV time? - CORRECT
ANSWER-t=2.5
Define the four parts of PIEV - CORRECT ANSWER-Perception, Identification,
Emotion, Volition
Name four of the variables in the SSD equation - CORRECT ANSWER-u= speed,
t= perception/reaction time, a= deceleration of vehicle, G = grade of roadway
In the SSD equation, what is the purpose of the 1.47ut? - CORRECT ANSWER-
the distance traveled by a vehicle between the time the driver observes an object
in the vehicle path and the time the vehicle actually comes to a rest
In the equation for stopping sight distance, what does the u
2/(30(a/g±G)) part of the equation
, represent? - CORRECT ANSWER-The braking distance given road
characteristics
What is AADT? - CORRECT ANSWER-Average Annual Daily Traffic = total
volume of vehicle traffic over one year
In the equation for determination of the radii of horizontal curves, what are fs
and e? - CORRECT ANSWER-fs= coefficient of side friction, e= rate of
superelevation
Name the three forces shown in the free-body diagram of a vehicle negotiating a
super-elevated
horizontal curve. - CORRECT ANSWER-Weight of vehicle, frictional force,
centrifugal force
What is the difference between ADT and AADT? - CORRECT ANSWER-ADT is
average daily traffic and AADT is average annual daily traffic
Where would you expect to find a spiral curve? - CORRECT ANSWER-Between
tangents and circular curves or between two adjacent circular curves with
substantially different radii
Questions and Correct Detailed Already Graded
A+
What is the AASHTO design value for the typical PIEV time? - CORRECT
ANSWER-t=2.5
Define the four parts of PIEV - CORRECT ANSWER-Perception, Identification,
Emotion, Volition
Name four of the variables in the SSD equation - CORRECT ANSWER-u= speed,
t= perception/reaction time, a= deceleration of vehicle, G = grade of roadway
In the SSD equation, what is the purpose of the 1.47ut? - CORRECT ANSWER-
the distance traveled by a vehicle between the time the driver observes an object
in the vehicle path and the time the vehicle actually comes to a rest
In the equation for stopping sight distance, what does the u
2/(30(a/g±G)) part of the equation
, represent? - CORRECT ANSWER-The braking distance given road
characteristics
What is AADT? - CORRECT ANSWER-Average Annual Daily Traffic = total
volume of vehicle traffic over one year
In the equation for determination of the radii of horizontal curves, what are fs
and e? - CORRECT ANSWER-fs= coefficient of side friction, e= rate of
superelevation
Name the three forces shown in the free-body diagram of a vehicle negotiating a
super-elevated
horizontal curve. - CORRECT ANSWER-Weight of vehicle, frictional force,
centrifugal force
What is the difference between ADT and AADT? - CORRECT ANSWER-ADT is
average daily traffic and AADT is average annual daily traffic
Where would you expect to find a spiral curve? - CORRECT ANSWER-Between
tangents and circular curves or between two adjacent circular curves with
substantially different radii
