CO Roadway Lighting Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
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1. What is the primary purpose of roadway lighting?
A. To increase vehicle speed
B. To illuminate only traffic signals
C. To improve visibility and safety for roadway users
D. To eliminate the need for reflective signs
Answer: C. To improve visibility and safety for roadway users
Rationale: Roadway lighting is primarily installed to improve visibility
for motorists, pedestrians, cyclists, and other roadway users. Proper
illumination can help reveal roadway geometry, obstacles,
pedestrians, signs, intersections, and other potential hazards.
2. Which type of lamp has historically been widely used for roadway
lighting because of its high efficiency and long service life?
,A. Incandescent lamp
B. High-pressure sodium lamp
C. Carbon arc lamp
D. Halogen lamp
Answer: B. High-pressure sodium lamp
Rationale: High-pressure sodium (HPS) lamps have historically been
common in roadway and area lighting because they provide high
luminous efficacy and relatively long service life. Modern installations
increasingly use LED technology because LEDs offer additional
advantages such as controllability and improved energy efficiency.
3. What is the most important consideration when positioning a
roadway lighting pole near the edge of a traveled roadway?
A. Paint color of the pole
B. Pole manufacturer's logo
C. Roadway safety and required clearances
D. Height of nearby buildings
Answer: C. Roadway safety and required clearances
Rationale: Lighting poles must be positioned to provide adequate
illumination while maintaining appropriate clearances from traffic
and other hazards. Pole placement should account for roadway
,geometry, offsets, utilities, pedestrian facilities, and applicable safety
requirements.
4. What does illuminance measure?
A. Electrical resistance
B. Light falling onto a surface
C. Light emitted by a lamp
D. Electrical power consumed by a fixture
Answer: B. Light falling onto a surface
Rationale: Illuminance describes the amount of luminous flux incident
on a surface. It is commonly expressed in footcandles in U.S. lighting
practice or lux in the metric system.
5. Which unit is commonly used in the United States to express
roadway illuminance?
A. Ohm
B. Ampere
C. Footcandle
D. Watt-hour
Answer: C. Footcandle
, Rationale: Footcandles are commonly used to express illuminance in
U.S. lighting applications. One footcandle represents one lumen
distributed over an area of one square foot.
6. What is the primary purpose of a lighting photometric design?
A. To determine the color of the pole
B. To predict the distribution and level of light on the roadway
C. To determine the weight of the concrete foundation
D. To select the contractor's insurance provider
Answer: B. To predict the distribution and level of light on the
roadway
Rationale: Photometric design evaluates how light from fixtures will
be distributed across the roadway and surrounding areas. It helps
determine fixture type, mounting height, spacing, aiming, and
expected illumination levels.
7. What is a common advantage of LED roadway luminaires?
A. They require continuous filament replacement
B. They generally have high energy efficiency and long service life
C. They cannot be dimmed
D. They require mercury vapor to operate
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of roadway lighting?
A. To increase vehicle speed
B. To illuminate only traffic signals
C. To improve visibility and safety for roadway users
D. To eliminate the need for reflective signs
Answer: C. To improve visibility and safety for roadway users
Rationale: Roadway lighting is primarily installed to improve visibility
for motorists, pedestrians, cyclists, and other roadway users. Proper
illumination can help reveal roadway geometry, obstacles,
pedestrians, signs, intersections, and other potential hazards.
2. Which type of lamp has historically been widely used for roadway
lighting because of its high efficiency and long service life?
,A. Incandescent lamp
B. High-pressure sodium lamp
C. Carbon arc lamp
D. Halogen lamp
Answer: B. High-pressure sodium lamp
Rationale: High-pressure sodium (HPS) lamps have historically been
common in roadway and area lighting because they provide high
luminous efficacy and relatively long service life. Modern installations
increasingly use LED technology because LEDs offer additional
advantages such as controllability and improved energy efficiency.
3. What is the most important consideration when positioning a
roadway lighting pole near the edge of a traveled roadway?
A. Paint color of the pole
B. Pole manufacturer's logo
C. Roadway safety and required clearances
D. Height of nearby buildings
Answer: C. Roadway safety and required clearances
Rationale: Lighting poles must be positioned to provide adequate
illumination while maintaining appropriate clearances from traffic
and other hazards. Pole placement should account for roadway
,geometry, offsets, utilities, pedestrian facilities, and applicable safety
requirements.
4. What does illuminance measure?
A. Electrical resistance
B. Light falling onto a surface
C. Light emitted by a lamp
D. Electrical power consumed by a fixture
Answer: B. Light falling onto a surface
Rationale: Illuminance describes the amount of luminous flux incident
on a surface. It is commonly expressed in footcandles in U.S. lighting
practice or lux in the metric system.
5. Which unit is commonly used in the United States to express
roadway illuminance?
A. Ohm
B. Ampere
C. Footcandle
D. Watt-hour
Answer: C. Footcandle
, Rationale: Footcandles are commonly used to express illuminance in
U.S. lighting applications. One footcandle represents one lumen
distributed over an area of one square foot.
6. What is the primary purpose of a lighting photometric design?
A. To determine the color of the pole
B. To predict the distribution and level of light on the roadway
C. To determine the weight of the concrete foundation
D. To select the contractor's insurance provider
Answer: B. To predict the distribution and level of light on the
roadway
Rationale: Photometric design evaluates how light from fixtures will
be distributed across the roadway and surrounding areas. It helps
determine fixture type, mounting height, spacing, aiming, and
expected illumination levels.
7. What is a common advantage of LED roadway luminaires?
A. They require continuous filament replacement
B. They generally have high energy efficiency and long service life
C. They cannot be dimmed
D. They require mercury vapor to operate
