Louisiana (LA) Highway, Street & Bridge Construction
Contractor 2026/2027 Exam verified with correct answers plus
rationales
1. What is the primary purpose of proper subgrade preparation before paving?
A. To reduce traffic volume
B. To provide a stable foundation for the pavement
C. To eliminate the need for drainage
D. To increase pavement color
Answer: B. To provide a stable foundation for the pavement.
Rationale: A properly prepared subgrade provides uniform support and helps prevent settlement
and pavement failure.
2. Which activity is most directly associated with earthwork?
A. Traffic signal programming
B. Excavation and grading
C. Electrical wiring inside buildings
D. Interior painting
Answer: B. Excavation and grading.
Rationale: Earthwork includes excavation, grading, filling, backfilling, trenching, and
compaction.
3. What is the primary function of a roadway crown?
A. Increase lane width
B. Direct surface water toward drainage areas
C. Reduce pavement thickness
D. Increase vehicle speed
Answer: B. Direct surface water toward drainage areas.
Rationale: The crown provides transverse slope so rainfall drains away from the roadway
surface.
,4. Which material is commonly used as aggregate in asphalt pavement?
A. Crushed stone
B. Untreated wood
C. Drywall
D. Glass insulation
Answer: A. Crushed stone.
Rationale: Crushed stone and other properly graded aggregates form the structural mineral
component of asphalt mixtures.
5. What is compaction intended to accomplish?
A. Increase soil voids
B. Reduce density
C. Increase material density and stability
D. Add water to pavement
Answer: C. Increase material density and stability.
Rationale: Compaction reduces air voids and increases the density and load-bearing
characteristics of soil or aggregate.
6. Which piece of equipment is commonly used to compact asphalt?
A. Vibratory roller
B. Backhoe bucket only
C. Concrete saw
D. Water pump
Answer: A. Vibratory roller.
Rationale: Rollers compact asphalt while it is within the appropriate temperature and
workability range.
7. What is the primary purpose of a culvert?
A. Carry electrical power
B. Allow water to pass beneath a roadway or embankment
C. Increase pavement thickness
D. Store construction equipment
Answer: B. Allow water to pass beneath a roadway or embankment.
, Rationale: Culverts provide controlled passage for drainage water under roads and other
structures.
8. What can occur if a roadway drainage system is inadequate?
A. Improved pavement life
B. Water accumulation and pavement deterioration
C. Reduced erosion
D. Increased soil strength
Answer: B. Water accumulation and pavement deterioration.
Rationale: Standing water and poor drainage can weaken pavement layers and contribute to
erosion and structural damage.
9. Before placing concrete pavement, the contractor should verify that the base is:
A. Uncompacted
B. Properly prepared and stable
C. Saturated with water
D. Covered with loose debris
Answer: B. Properly prepared and stable.
Rationale: Concrete pavement requires an adequately prepared support layer to minimize
settlement and cracking.
10. What is the purpose of reinforcing steel in concrete pavement or structures?
A. Provide electrical conductivity
B. Help resist tensile stresses
C. Reduce aggregate size
D. Replace cement
Answer: B. Help resist tensile stresses.
Rationale: Concrete is strong in compression but relatively weak in tension; reinforcement helps
resist tensile stresses.
11. Which soil condition generally requires particular attention before construction?
A. Uniformly compacted soil
Contractor 2026/2027 Exam verified with correct answers plus
rationales
1. What is the primary purpose of proper subgrade preparation before paving?
A. To reduce traffic volume
B. To provide a stable foundation for the pavement
C. To eliminate the need for drainage
D. To increase pavement color
Answer: B. To provide a stable foundation for the pavement.
Rationale: A properly prepared subgrade provides uniform support and helps prevent settlement
and pavement failure.
2. Which activity is most directly associated with earthwork?
A. Traffic signal programming
B. Excavation and grading
C. Electrical wiring inside buildings
D. Interior painting
Answer: B. Excavation and grading.
Rationale: Earthwork includes excavation, grading, filling, backfilling, trenching, and
compaction.
3. What is the primary function of a roadway crown?
A. Increase lane width
B. Direct surface water toward drainage areas
C. Reduce pavement thickness
D. Increase vehicle speed
Answer: B. Direct surface water toward drainage areas.
Rationale: The crown provides transverse slope so rainfall drains away from the roadway
surface.
,4. Which material is commonly used as aggregate in asphalt pavement?
A. Crushed stone
B. Untreated wood
C. Drywall
D. Glass insulation
Answer: A. Crushed stone.
Rationale: Crushed stone and other properly graded aggregates form the structural mineral
component of asphalt mixtures.
5. What is compaction intended to accomplish?
A. Increase soil voids
B. Reduce density
C. Increase material density and stability
D. Add water to pavement
Answer: C. Increase material density and stability.
Rationale: Compaction reduces air voids and increases the density and load-bearing
characteristics of soil or aggregate.
6. Which piece of equipment is commonly used to compact asphalt?
A. Vibratory roller
B. Backhoe bucket only
C. Concrete saw
D. Water pump
Answer: A. Vibratory roller.
Rationale: Rollers compact asphalt while it is within the appropriate temperature and
workability range.
7. What is the primary purpose of a culvert?
A. Carry electrical power
B. Allow water to pass beneath a roadway or embankment
C. Increase pavement thickness
D. Store construction equipment
Answer: B. Allow water to pass beneath a roadway or embankment.
, Rationale: Culverts provide controlled passage for drainage water under roads and other
structures.
8. What can occur if a roadway drainage system is inadequate?
A. Improved pavement life
B. Water accumulation and pavement deterioration
C. Reduced erosion
D. Increased soil strength
Answer: B. Water accumulation and pavement deterioration.
Rationale: Standing water and poor drainage can weaken pavement layers and contribute to
erosion and structural damage.
9. Before placing concrete pavement, the contractor should verify that the base is:
A. Uncompacted
B. Properly prepared and stable
C. Saturated with water
D. Covered with loose debris
Answer: B. Properly prepared and stable.
Rationale: Concrete pavement requires an adequately prepared support layer to minimize
settlement and cracking.
10. What is the purpose of reinforcing steel in concrete pavement or structures?
A. Provide electrical conductivity
B. Help resist tensile stresses
C. Reduce aggregate size
D. Replace cement
Answer: B. Help resist tensile stresses.
Rationale: Concrete is strong in compression but relatively weak in tension; reinforcement helps
resist tensile stresses.
11. Which soil condition generally requires particular attention before construction?
A. Uniformly compacted soil
