IMSA Traffic Signal Technician 1
2025/2026 Exam Questions and Answers
| 100% Solved
IMSA - 🧠 ANSWER ✔✔The International Municipal Signal Association
(IMSA) is the
oldest known association of its kind in the world. The
organization originated in 1896 and counts Thomas A. Edison
and the Edison Electric Company among its esteemed
members. Today, IMSA certifies tens of thousands of
technicians and stands as the most regarded name in public
safety.
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
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,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,
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, 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
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
2025/2026 Exam Questions and Answers
| 100% Solved
IMSA - 🧠 ANSWER ✔✔The International Municipal Signal Association
(IMSA) is the
oldest known association of its kind in the world. The
organization originated in 1896 and counts Thomas A. Edison
and the Edison Electric Company among its esteemed
members. Today, IMSA certifies tens of thousands of
technicians and stands as the most regarded name in public
safety.
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
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,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,
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, 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
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
