IMSA Traffic Control Tech 1 Questions And
Answers
Understanding electricity 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 E = I x R
E = Voltage(Electromotive Force) (V...
Understanding electricity 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 E=IxR
E = Voltage(Electromotive Force) (Volts)
I = Current(Intensity) (Amps)
R = Resistance (Ohms)
120 VAC/ 24 VDC Typical voltages used in traffic signal circuits
Alternating Current 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
, IMSA Traffic Control Tech 1 Questions And
Answers
Direct Current electrons flow in one direction
5, 12, 24 Volts usually
EX. Batteries, power supplies
Bonding and grounding Joining metallic parts and using them to provide an electrically
conductive path to the ground
Phases 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 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 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 Separates opposing phases to avoid conflicting movements at the same time. Also
helps in rings relationship
, IMSA Traffic Control Tech 1 Questions And
Answers
Protected Phases Provide exclusive right-of-way to a specific movement, allowing
passage with no conflicting traffic
Permissive Phases 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 Turning movement counts - data on traffic volume
Signal phasing- data on terrain
Minimum green time- time to clear intersection
Pedestrian clear time
Yellow & All-Red Intervals
Coordination & Optimization
Split Allocation of time within a single cycle for a specific movement or phase. it
represent the duration or percentage
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