100+ Free IMSA Roadway Lighting I Practice Questions

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Question 1

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What is the unit of measurement for illuminance on a roadway surface?

Candelas

Lumens

Footcandles (or lux)

Watts

to track

2026 Statistics

Key Facts: IMSA Roadway Lighting I Exam

Exam Questions

IMSA

70%

Passing Score

IMSA

3 hrs

Exam Duration

IMSA

$500

Exam Fee (Members)

IMSA

~70-80%

First-Time Pass Rate

Industry estimate

3 years

Certification Validity

IMSA

The IMSA Roadway Lighting Technician Level I exam has 50 multiple-choice questions in 3 hours with a 70% passing score. Major topics: Electrical Safety & Codes (20%), Basic Electricity (15%), Lamps & Luminaires (15%), Poles & High Mast (15%), Lighting Design (10%), Construction & Maintenance (10%), Energy Efficiency (10%), Testing (5%). Requires Work Zone cert and 1 year experience.

Sample IMSA Roadway Lighting I Practice Questions

Try these sample questions to test your IMSA Roadway Lighting I exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the unit of measurement for illuminance on a roadway surface?

A.Candelas

B.Lumens

C.Footcandles (or lux)

D.Watts

Explanation: Illuminance is measured in footcandles (imperial) or lux (metric). One footcandle equals one lumen per square foot, while one lux equals one lumen per square meter. Illuminance describes how much light reaches the roadway surface and is a primary design metric used in roadway lighting per IESNA RP-8.

2What does 'luminance' measure in roadway lighting?

A.The total power consumed by the luminaire

B.The brightness of the roadway surface as perceived by a driver, measured in candelas per square meter

C.The height of the luminaire pole

D.The diameter of the lamp

Explanation: Luminance measures the brightness of the roadway surface as perceived by a driver, measured in candelas per square meter (cd/m2). Unlike illuminance (which measures light falling on the surface), luminance accounts for how much light is reflected toward the driver. Luminance depends on both the light level and the pavement reflectance properties.

3What does 'uniformity ratio' indicate in a roadway lighting design?

A.The number of luminaires used

B.The ratio of average to minimum illuminance, indicating how evenly light is distributed across the roadway

C.The color of the light

D.The wattage of each luminaire

Explanation: The uniformity ratio (average-to-minimum) indicates how evenly light is distributed across the roadway. A lower ratio means more uniform light distribution, which improves driver visibility and comfort. IESNA RP-8 specifies maximum uniformity ratios (such as 3:1 or 4:1) depending on the roadway classification.

4Which lamp type has largely replaced high-pressure sodium (HPS) for new roadway lighting installations?

A.Incandescent

B.Mercury vapor

C.LED (Light Emitting Diode)

D.Fluorescent

Explanation: LED technology has largely replaced HPS for new roadway lighting installations due to superior energy efficiency, longer life span (typically 100,000+ hours), better color rendering, instant-on capability, and compatibility with dimming controls. LEDs also produce white light that improves nighttime visibility compared to the yellow-orange light of HPS lamps.

5What is a key characteristic of high-pressure sodium (HPS) lamp light output?

A.Blue-white light with excellent color rendering

B.Yellow-orange light with moderate color rendering

C.Full-spectrum white light

D.Red light output

Explanation: High-pressure sodium lamps produce a characteristic yellow-orange light with a Color Rendering Index (CRI) of approximately 22-25. While highly efficient in converting electricity to light, HPS lamps make it difficult to distinguish colors at night. This is one reason LED technology, which produces white light with CRI values of 70+, has replaced HPS in many applications.

6What is the typical rated life expectancy of an LED roadway luminaire?

A.2,000 hours

B.10,000 hours

C.50,000 to 100,000+ hours

D.500 hours

Explanation: LED roadway luminaires typically have a rated life expectancy of 50,000 to 100,000+ hours, measured at the L70 point (when light output drops to 70% of initial lumens). At 12 hours per night of operation, this translates to approximately 11-23 years. This long life dramatically reduces maintenance costs compared to HPS lamps that last 24,000-40,000 hours.

7What is the function of a photocontrol (photocell) on a roadway lighting system?

A.To adjust the color temperature of the light

B.To automatically turn lights on at dusk and off at dawn based on ambient light levels

C.To regulate the voltage to the luminaire

D.To protect the luminaire from surge damage

Explanation: A photocontrol (photocell) automatically switches roadway lights on at dusk and off at dawn by sensing ambient light levels. The photocontrol has a light-sensitive element that triggers the switch when light falls below a set threshold (typically 1-3 footcandles). This eliminates the need for manual switching or time clocks that would require seasonal adjustment.

8What is the NEMA twist-lock receptacle standard for mounting photocontrols on roadway luminaires?

A.Edison screw base

B.ANSI C136.10 (NEMA twist-lock)

C.Bayonet base

D.Mogul base

Explanation: The ANSI C136.10 standard defines the NEMA twist-lock photocontrol receptacle used on roadway luminaires. This standardized three-prong receptacle allows photocontrols from different manufacturers to be interchangeable. The twist-lock design ensures a secure, weatherproof connection that will not vibrate loose.

9In a parallel circuit, what happens to the remaining luminaires if one luminaire fails (open circuit)?

A.All luminaires on the circuit go dark

B.The remaining luminaires continue to operate normally

C.The remaining luminaires get brighter

D.The circuit breaker trips immediately

Explanation: In a parallel circuit, each luminaire has its own independent path from the power source. If one luminaire fails as an open circuit, the remaining luminaires continue to operate normally because their current paths are unaffected. This is the primary advantage of parallel circuits for roadway lighting: one failure does not affect the rest of the system.

10In a series lighting circuit, what happens if one lamp fails (open circuit) WITHOUT an isolation device?

A.Only the failed lamp goes dark

B.All lamps on the circuit go dark because the circuit is broken

C.The circuit voltage doubles

D.Nothing happens

Explanation: In a series circuit, all lamps share a single current path. If one lamp fails as an open circuit, the entire circuit is broken and all lamps go dark. This is why series circuits use film cutouts or isolation transformers that automatically bypass a failed lamp to maintain the circuit. Series circuits are used primarily for high-mast and highway lighting.

About the IMSA Roadway Lighting I Exam

The IMSA Roadway Lighting Technician Level I certification covers fundamental knowledge and skill sets for roadway lighting work. The exam tests electrical safety codes, basic electricity, laws and jurisdictional requirements, construction and maintenance, energy efficiency, lamp and luminaire components, electrical service, poles and high mast components, lighting design fundamentals, lighting applications, testing, and troubleshooting.

Questions

50 scored questions

Time Limit

3 hours

Passing Score

70% correct

Exam Fee

$500 members / $525 non-members (IMSA)

IMSA Roadway Lighting I Exam Content Outline

20%

Electrical Safety and Codes

NEC requirements, NESC standards, electrical safety codes, and safe work practices

15%

Basic Electricity

Voltage, current, resistance, Ohm's law, circuits, and electrical calculations

15%

Lamps and Luminaires

LED technology, lamp types, luminaire components, photometric performance, and optics

15%

Poles and High Mast Components

Pole types, foundations, high mast assemblies, lowering devices, and structural considerations

10%

Lighting Design Fundamentals

Illuminance levels, uniformity ratios, lighting classifications, and design criteria

10%

Construction and Maintenance

Installation procedures, preventive maintenance, troubleshooting, and recordkeeping

10%

Energy Efficiency

LED conversion, dimming controls, energy audits, and smart lighting systems

Testing and Troubleshooting

Multimeter use, circuit testing, fault isolation, and diagnostic procedures

How to Pass the IMSA Roadway Lighting I Exam

What You Need to Know

Passing score: 70% correct
Exam length: 50 questions
Time limit: 3 hours
Exam fee: $500 members / $525 non-members

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

IMSA Roadway Lighting I Study Tips from Top Performers

1Master basic electrical calculations: Ohm's law (V=IR), power formula (P=VI), and series vs parallel circuit behavior

2Know the NEC and NESC requirements specific to roadway lighting installations including grounding and clearances

3Study LED luminaire specifications including efficacy (lumens per watt), CCT, CRI, and driver types

4Understand pole types, foundation designs, and high mast lowering device operation and inspection

5Review lighting design fundamentals including illuminance levels, uniformity ratios, and AASHTO/IES criteria

Frequently Asked Questions

What is the IMSA Roadway Lighting Technician Level I exam?

The IMSA RLT-I is the foundational certification for roadway lighting professionals. It has 50 multiple-choice questions in 3 hours covering electrical safety, basic electricity, luminaires, poles, lighting design, and maintenance. A 70% score is required to pass.

What are the IMSA Roadway Lighting Level I prerequisites?

You need a current IMSA Work Zone Temporary Traffic Control Technician certification (or approved equivalent) and 1 year of roadway lighting operation experience.

How hard is the IMSA Roadway Lighting Level I exam?

The exam is moderate difficulty with a 70-80% first-time pass rate. It requires knowledge of basic electricity, NEC/NESC codes, and lighting fundamentals. Most candidates study 40-60 hours over 4-6 weeks.

What electrical knowledge is required?

You need to understand basic electricity concepts including voltage, current, resistance, Ohm's law, series and parallel circuits, and power calculations. Knowledge of NEC and NESC safety codes applicable to roadway lighting is also essential.

Does the exam cover LED technology?

Yes, the exam covers LED luminaire technology including efficacy, color temperature, driver specifications, dimming, and the benefits of LED conversion over traditional HID sources. Energy efficiency is approximately 10% of the exam.

What comes after Roadway Lighting Level I?

After Level I, you can pursue the IMSA Roadway Lighting Technician Level II certification, which covers advanced lighting design, photometric analysis, smart controls, and project management. It requires your current Level I and 2 years of experience.

How is Roadway Lighting different from Traffic Signal certification?

Roadway Lighting focuses on street and highway illumination systems including luminaires, poles, electrical distribution, and lighting design. Traffic Signal focuses on intersection signal operations, controllers, detection, and timing. They are separate certification tracks.