Louisiana (LA) Highway, Street & Bridge Construction
Exam Questions And 100% Correct Answers (Verified) Plus
Rationales | Latest Update 2026/2027 (Guaranteed Pass)
1. What is the primary function of the Louisiana Department of
Transportation and Development (DOTD) in highway
construction?
A. Issue environmental permits
B. Oversee design, construction, and maintenance of
transportation infrastructure C. Regulate fuel taxes
D. Approve contractor bids
Rationale: DOTD manages the entire lifecycle of road
infrastructure including design and construction.
2. The maximum allowable slump for structural concrete in bridge
decks under DOTD standards is generally:
A. 4 inches
B. 6 inches
C. 2 inches
D. 8 inches
Rationale: DOTD specifies 4 inches for standard deck placement
for proper workability.
3. What is the purpose of a geotechnical investigation before road
construction?
A. To test asphalt durability
B. To determine soil bearing capacity and suitability
C. To measure pavement temperature
D. To estimate labor cost
Rationale: Soil data determines the foundation requirements for
road stability.
,4. In asphalt paving, the “tack coat” serves to:
A. Protect against UV degradation
B. Bond new asphalt layers to the old surface
C. Prevent oxidation
D. Enhance skid resistance
Rationale: Tack coat ensures adhesion between asphalt layers.
5. Which test is used to determine the plasticity of soil?
A. Sieve analysis
B. Atterberg limits test
C. CBR test
D. Moisture-density test
Rationale: Atterberg limits classify fine-grained soils by plasticity
and consistency.
6. In concrete bridge construction, what is the minimum curing
time before form removal, unless otherwise specified?
A. 7 days
B. 3 days or until sufficient strength is achieved
C. 24 hours
D. 10 days
Rationale: Early removal is allowed if test cylinders confirm
adequate strength.
7. A “crown” in highway design refers to:
A. Edge drainage
B. The highest point in the center of the roadway
C. Median barrier
D. Pavement shoulder
Rationale: The crown allows for water runoff to both sides.
, 8. The typical bitumen content in asphalt concrete mix ranges
between: A. 3–4%
B. 4–6%
C. 7–9%
D. 1–3%
Rationale: Optimum asphalt binder content generally lies within
4–6% by weight.
9. The Louisiana standard specification for compaction requires
subgrade to be compacted to at least: A. 90% of maximum
dry density
B. 95% of maximum dry density
C. 85% of maximum dry density
D. 100% of maximum dry density
Rationale: DOTD typically requires 95% compaction for subgrade
under highways.
10. What is the main function of expansion joints in bridges?
A. Prevent corrosion
B. Increase stiffness
C. Allow movement due to temperature changes
D. Reduce load capacity
Rationale: Expansion joints accommodate thermal expansion and
contraction.
11. In Louisiana, a Type “B” borrow material is classified as:
A. Topsoil for landscaping
B. Suitable fill material meeting DOTD gradation standards
C. Crushed aggregate
Exam Questions And 100% Correct Answers (Verified) Plus
Rationales | Latest Update 2026/2027 (Guaranteed Pass)
1. What is the primary function of the Louisiana Department of
Transportation and Development (DOTD) in highway
construction?
A. Issue environmental permits
B. Oversee design, construction, and maintenance of
transportation infrastructure C. Regulate fuel taxes
D. Approve contractor bids
Rationale: DOTD manages the entire lifecycle of road
infrastructure including design and construction.
2. The maximum allowable slump for structural concrete in bridge
decks under DOTD standards is generally:
A. 4 inches
B. 6 inches
C. 2 inches
D. 8 inches
Rationale: DOTD specifies 4 inches for standard deck placement
for proper workability.
3. What is the purpose of a geotechnical investigation before road
construction?
A. To test asphalt durability
B. To determine soil bearing capacity and suitability
C. To measure pavement temperature
D. To estimate labor cost
Rationale: Soil data determines the foundation requirements for
road stability.
,4. In asphalt paving, the “tack coat” serves to:
A. Protect against UV degradation
B. Bond new asphalt layers to the old surface
C. Prevent oxidation
D. Enhance skid resistance
Rationale: Tack coat ensures adhesion between asphalt layers.
5. Which test is used to determine the plasticity of soil?
A. Sieve analysis
B. Atterberg limits test
C. CBR test
D. Moisture-density test
Rationale: Atterberg limits classify fine-grained soils by plasticity
and consistency.
6. In concrete bridge construction, what is the minimum curing
time before form removal, unless otherwise specified?
A. 7 days
B. 3 days or until sufficient strength is achieved
C. 24 hours
D. 10 days
Rationale: Early removal is allowed if test cylinders confirm
adequate strength.
7. A “crown” in highway design refers to:
A. Edge drainage
B. The highest point in the center of the roadway
C. Median barrier
D. Pavement shoulder
Rationale: The crown allows for water runoff to both sides.
, 8. The typical bitumen content in asphalt concrete mix ranges
between: A. 3–4%
B. 4–6%
C. 7–9%
D. 1–3%
Rationale: Optimum asphalt binder content generally lies within
4–6% by weight.
9. The Louisiana standard specification for compaction requires
subgrade to be compacted to at least: A. 90% of maximum
dry density
B. 95% of maximum dry density
C. 85% of maximum dry density
D. 100% of maximum dry density
Rationale: DOTD typically requires 95% compaction for subgrade
under highways.
10. What is the main function of expansion joints in bridges?
A. Prevent corrosion
B. Increase stiffness
C. Allow movement due to temperature changes
D. Reduce load capacity
Rationale: Expansion joints accommodate thermal expansion and
contraction.
11. In Louisiana, a Type “B” borrow material is classified as:
A. Topsoil for landscaping
B. Suitable fill material meeting DOTD gradation standards
C. Crushed aggregate
