This set of Traffic Engineering Interview Questions and Answers for freshers focuses on “Road Characteristics – 2”.
1. A Spiral transition curve has a varying radius.
a) True
b) False
View Answer
Explanation: The above statement, “A Spiral transition curve has a varying radius” is true. It starts with its radius at infinity and then ends at the radius of the circular curve.
2. If the degree of curvature is higher then the curve is ______
a) sharper
b) flatter
c) vertical
d) elliptical
View Answer
Explanation: If the degree of curvature is higher then the curve is sharper. The severity of the circular horizontal curve is Degree of curvature.
3. What is the maximum side slope of cut and fill section where sandy soil is predominant?
a) 1:2
b) 3:1
c) 6:1
d) 10:1
View Answer
Explanation: The maximum side slope of cut and fill section where sandy soil is predominant is 6:1. 3:1 is the maximum side slope of cut and fill section for the safe functioning of maintenance and mowing actions.
4. What is the maximum superelevation in snowy areas?
a) 5%
b) 6%
c) 3%
d) 8%
View Answer
Explanation: The maximum superelevation in snowy areas is 8%. Superelevation is the total rise of roadway from edge to edge span of the roadway.
5. The value of side-friction factor varies with ______
a) design speed
b) superelevation
c) skidding
d) overturning
View Answer
Explanation: The value of side friction varies with design speed. Side-friction factor also represents frictional forces that can be easily accomplished.
6. In how many stages does the transition from a tangent section to super-elevated horizontal curve takes place?
a) 3
b) 2
c) 4
d) 5
View Answer
Explanation: In 2 stages, the transition from a tangent section to super-elevated horizontal curve takes place. Tangent runoff and superelevation runoff are the two stages of transition.
7. Length of the transition curve is the maximum of length due to _____
a) centrifugal force, superelevation, and empirical
b) centrifugal force, superelevation, and tangent
c) superelevation, centripetal, and empirical
d) superelevation, centripetal, and design speed
View Answer
Explanation: Length of transition curve is the maximum of length due to centrifugal force, superelevation, and empirical. Transition curve is the horizontal curve provided between straight alignment to a circular curve for a smooth transition.
8. Which one of the following is not an advantage of spiral transition?
a) Easy path for drivers to follow
b) Aesthetics
c) Agreeable arrangement of superelevation runoff
d) Less delay
View Answer
Explanation: Less delay is not an advantage of spiral transition. Easy path for drivers to follow, aesthetics, and agreeable arrangement of superelevation runoff are the advantages of spiral transition.
9. The distance from the centreline of the inside lane to the nearest roadside sight blockage is called.
a) Length of curve
b) Apex
c) Mid-ordinate
d) Tangent
View Answer
Explanation: The distance from the centreline of the inside lane to the nearest roadside sight blockage is called Mid-ordinate. The formula for mid-ordinate is,
M = R(1-cos θ/2)
where, M = mid-ordinate
R = radius of curvature
θ = angle of deflection.
10. What are the two types of vertical curves?
a) Crest and sag
b) Crest and plume
c) Sag and sink
d) Sink and fall
View Answer
Explanation: The two types of vertical curves are crest and sag. Crest, as the name suggests, is a vertical curve having its entry tangent grade greater than the exit tangent grade. While sag has its entry tangent grade smaller than its exit tangent grade.
11. What is the mid-ordinate of a curve with a radius of curvature 2m and angle of deflection = 60°?
a) 0.342
b) 0.268
c) 0.112
d) 0.245
View Answer
Explanation: M = R(1-cos θ/2)
where, M = mid-ordinate
R = radius of curvature
θ = angle of deflection
M = R(1-cos θ/2) = 2(1-cos60/2) = 0.268 m.
12. The sight distance in a sag vertical curve is limited by which factor given below during night time driving condition?
a) Design speed
b) Driver’s height
c) Headlamp range
d) Ruling speed
View Answer
Explanation: The sight distance in a sag vertical curve is limited by Headlamp range during night time driving condition. Sight distance is the length visible to the driver while travelling on the road.
13. Broken-back grade lines should be provided where ever practicable.
a) True
b) False
View Answer
Explanation: “Broken-back grade lines should be provided where ever practicable” is a false statement. Broken-back grade lines should be avoided where ever practicable. Broken-back grade lines are two consecutive vertical curves in the same orientation parted by a short tangent section.
14. Which of the following is not a feature of cross-section elements of a highway?
a) Shoulders
b) Side slopes
c) Curbs
d) Signal
View Answer
Explanation: Signal is not a feature of cross-section elements of a highway. Shoulders, side slopes, curbs, guardrails, and drainage channels are some of the features of a cross-sectional element of a highway.
Sanfoundry Global Education & Learning Series – Traffic Engineering.
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