IMSA Traffic Control Tech 1 Final
Exam Questions With 100% Correct
Answers (2025-2026) Updated.
High-Traffic Areas - Answer High-volume streets, such as arterials. Typically, wide and have
multiple lanes of travel.
Low-Traffic Areas - Answer Low-volume streets such as local streets or collector streets.
Typically narrow and have single lanes of travel.
Insulated Hand Tools - Answer Tools with insulated handles, designed to protect from electric
shock when working with live electricity.
Insulated Mats/Blankets - Answer Safe place to stand when working on electric systrems
Circuit Breaker Finders - Answer Tool that helps locate the appropriate circuit breaker or fuse
that controls the electrical supply to the area.
Conductors - Answer Materials that conduct electricity
Ex. Most metals
Insulators - Answer Materials that do not conduct electricity
EX. plastic, rubber, glass, ceramic
Understanding electricity - Answer Electricity is similar as water flowing through pipes
Voltage is like water pressure.
Current is like amount of water.
Resistance is like the size of the pipe.
Ohm's Law - Answer E = I x R
E = Voltage(Electromotive Force) (Volts)
, 120 VAC/ 24 VDC - Answer Typical voltages used in traffic signal circuits
Alternating Current - Answer The electrons flow in a switching direction going forward and
backwards. In a power grid usually 120 Volts at 60 cycles per second(Hertz)
EX.Powers homes, businesses, factories
Direct Current - Answer electrons flow in one direction
5, 12, 24 Volts usually
EX. Batteries, power supplies
Bonding and grounding - Answer Joining metallic parts and using them to provide an
electrically conductive path to the ground
Phases - Answer Through phases are typically even numbered and left turn phases are odd
numbered. Phases 1- 2- 5- 6 are the main street, while 3 -4 - 7 -8 are the side street
Concurrent group - Answer phases that are grouped on the same street. phases usually turn
on with the the others in their group. divided by barrier, e.g main street/ side street
Ring - Answer identifies phases that may operate one after another. organizing conflicting
phases such as a left turn not being on while through is on the opposite way.
Barrier - Answer Separates opposing phases to avoid conflicting movements at the same time.
Also helps in rings relationship
Protected Phases - Answer Provide exclusive right-of-way to a specific movement, allowing
passage with no conflicting traffic
Permissive Phases - Answer Allow movement to proceed with caution when there is a gap in
conflicting traffic. Usually yielding or giving right of way to crossing traffic
Calculating signal intervals - Answer Turning movement counts - data on traffic volume
Signal phasing- data on terrain
Exam Questions With 100% Correct
Answers (2025-2026) Updated.
High-Traffic Areas - Answer High-volume streets, such as arterials. Typically, wide and have
multiple lanes of travel.
Low-Traffic Areas - Answer Low-volume streets such as local streets or collector streets.
Typically narrow and have single lanes of travel.
Insulated Hand Tools - Answer Tools with insulated handles, designed to protect from electric
shock when working with live electricity.
Insulated Mats/Blankets - Answer Safe place to stand when working on electric systrems
Circuit Breaker Finders - Answer Tool that helps locate the appropriate circuit breaker or fuse
that controls the electrical supply to the area.
Conductors - Answer Materials that conduct electricity
Ex. Most metals
Insulators - Answer Materials that do not conduct electricity
EX. plastic, rubber, glass, ceramic
Understanding electricity - Answer Electricity is similar as water flowing through pipes
Voltage is like water pressure.
Current is like amount of water.
Resistance is like the size of the pipe.
Ohm's Law - Answer E = I x R
E = Voltage(Electromotive Force) (Volts)
, 120 VAC/ 24 VDC - Answer Typical voltages used in traffic signal circuits
Alternating Current - Answer The electrons flow in a switching direction going forward and
backwards. In a power grid usually 120 Volts at 60 cycles per second(Hertz)
EX.Powers homes, businesses, factories
Direct Current - Answer electrons flow in one direction
5, 12, 24 Volts usually
EX. Batteries, power supplies
Bonding and grounding - Answer Joining metallic parts and using them to provide an
electrically conductive path to the ground
Phases - Answer Through phases are typically even numbered and left turn phases are odd
numbered. Phases 1- 2- 5- 6 are the main street, while 3 -4 - 7 -8 are the side street
Concurrent group - Answer phases that are grouped on the same street. phases usually turn
on with the the others in their group. divided by barrier, e.g main street/ side street
Ring - Answer identifies phases that may operate one after another. organizing conflicting
phases such as a left turn not being on while through is on the opposite way.
Barrier - Answer Separates opposing phases to avoid conflicting movements at the same time.
Also helps in rings relationship
Protected Phases - Answer Provide exclusive right-of-way to a specific movement, allowing
passage with no conflicting traffic
Permissive Phases - Answer Allow movement to proceed with caution when there is a gap in
conflicting traffic. Usually yielding or giving right of way to crossing traffic
Calculating signal intervals - Answer Turning movement counts - data on traffic volume
Signal phasing- data on terrain
