IMSA TRAFFIC SIGNAL TECHNICIAN 1 EXAM
SCRIPT 2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS
◉First recorded attempt of regulating traffic flow with a mechanical
signal? (where, when, who, how) . Answer: Where: London, England
When: 1868
Who: J.P. Knight, railway engineer
How: Featured rotating arms with symbols indicating stop and go
◉Pivotal milestone of traffic signal? (Where, when, who, how) .
Answer: Where: Salt Lake City
When: 1912
Who: Lester Wire, Salt Lake City policeman
How: First electric traffic signal with red and green lights and buzzer to
guide vehicles
◉Significant breakthrough of traffic signal (Where, when, who, how) .
Answer: Where: Detroit
When: 1920
Who: William Potts, Detroit police officer
,How: Introduced concept of amber (yellow) light, adding a crucial
buffer
◉Garrett Augustus Morgan . Answer: African American inventor,
invented three position signal to add a warning position (1923,
patented). Also invented a gas mask to protect firefighters
◉NEMA . Answer: National Electrical Manufacturers Association -
Founded in 1926, neutral forum of members made up of business
leaders, electrical experts, engineers, scientists, technicians. ANSI-
accredited Standards Developing Organization
◉IMSA . Answer: International Municipal Signal Association
◉NESC . Answer: National Electrical Safety Code - general
requirements, safety rules for installation and maintenance of electric
supply stations, equipment, communication lines, etc
◉CALTRANS/170 . Answer: California Dept. of Transportation
◉ITE . Answer: Institute of Transportation Engineers
◉ATCC . Answer: Advanced Transportation Controller Cabinet
, ◉ATC . Answer: Advanced Transportation Controller
◉SDS . Answer: Safety Data Sheets
◉Purpose of Safety Data Sheets . Answer: Offer safety information for
chemicals you may use in your work environment, 16 sections, UN
adopted Globally Harmonized System of Classification of Labeling &
chemicals in 2003
◉NEC . Answer: National Electrical Code Handbook - provides
detailed interpretations etc to accompany the National Electric Code.
Published by NFPA - National Fire Protection Association
◉Which document determines the hierarchy of utilities on a utility pole?
. Answer: NESC
◉Part 4 of the ____ determines all guidance for traffic signals? .
Answer: MUTCD
◉What does OSHA stand for? . Answer: Occupational Safety and
Health Administration
◉Who published the NEC? . Answer: National Fire Protection
Association
SCRIPT 2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS
◉First recorded attempt of regulating traffic flow with a mechanical
signal? (where, when, who, how) . Answer: Where: London, England
When: 1868
Who: J.P. Knight, railway engineer
How: Featured rotating arms with symbols indicating stop and go
◉Pivotal milestone of traffic signal? (Where, when, who, how) .
Answer: Where: Salt Lake City
When: 1912
Who: Lester Wire, Salt Lake City policeman
How: First electric traffic signal with red and green lights and buzzer to
guide vehicles
◉Significant breakthrough of traffic signal (Where, when, who, how) .
Answer: Where: Detroit
When: 1920
Who: William Potts, Detroit police officer
,How: Introduced concept of amber (yellow) light, adding a crucial
buffer
◉Garrett Augustus Morgan . Answer: African American inventor,
invented three position signal to add a warning position (1923,
patented). Also invented a gas mask to protect firefighters
◉NEMA . Answer: National Electrical Manufacturers Association -
Founded in 1926, neutral forum of members made up of business
leaders, electrical experts, engineers, scientists, technicians. ANSI-
accredited Standards Developing Organization
◉IMSA . Answer: International Municipal Signal Association
◉NESC . Answer: National Electrical Safety Code - general
requirements, safety rules for installation and maintenance of electric
supply stations, equipment, communication lines, etc
◉CALTRANS/170 . Answer: California Dept. of Transportation
◉ITE . Answer: Institute of Transportation Engineers
◉ATCC . Answer: Advanced Transportation Controller Cabinet
, ◉ATC . Answer: Advanced Transportation Controller
◉SDS . Answer: Safety Data Sheets
◉Purpose of Safety Data Sheets . Answer: Offer safety information for
chemicals you may use in your work environment, 16 sections, UN
adopted Globally Harmonized System of Classification of Labeling &
chemicals in 2003
◉NEC . Answer: National Electrical Code Handbook - provides
detailed interpretations etc to accompany the National Electric Code.
Published by NFPA - National Fire Protection Association
◉Which document determines the hierarchy of utilities on a utility pole?
. Answer: NESC
◉Part 4 of the ____ determines all guidance for traffic signals? .
Answer: MUTCD
◉What does OSHA stand for? . Answer: Occupational Safety and
Health Administration
◉Who published the NEC? . Answer: National Fire Protection
Association
