IMSA TRAFFIC SIGNAL TECHNICIAN EXAM
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS COMPLETE REVIEW MATERIAL
●● 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
●● 3 common causes of accidents
Answer: 1) Driver mistakes or distractions
2) Failures or malfunction sin vehicle equipment
3) Adverse weather conditions
●● Negligence
Answer: Failure to exercise a reasonable standard of care
●● Gross negligence
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS COMPLETE REVIEW MATERIAL
●● 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
●● 3 common causes of accidents
Answer: 1) Driver mistakes or distractions
2) Failures or malfunction sin vehicle equipment
3) Adverse weather conditions
●● Negligence
Answer: Failure to exercise a reasonable standard of care
●● Gross negligence
