Exam (elaborations)
IMSA Traffic Control Tech 1 Questions and answers
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IMSA Traffic Control Tech 1 Questions and answers
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IMSA Traffic Control Tech 1120 VAC/ 24 VDC - questions and answers-Typical voltages used in traffic signal circuits
5 types of cabinents - questions and answers-electrical mechanical/ pre NEMA
NEMA TS1- Military style a,b,c,sometimes d
NEMA TS2- 14 Pin Serial Connector port 1
CALTRANS/170/179/2070
ATC
ada req - questions and answers-audible signal shou;d be 2db over ambient noise level not over
5db. also button needs vibration or raised arrow
Alternating Current - questions and answers-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
Back Panel - questions and answers-control and interface with diff components. main controller
board, input/output boards, comm boards, and specialized boards for specific functions
Barrier - questions and answers-Separates opposing phases to avoid conflicting movements at
the same time. Also helps in rings relationship
Bonding and grounding - questions and answers-Joining metallic parts and using them to
provide an electrically conductive path to the ground
BUS/BIU - questions and answers-central control unit, allowing communication between
controller and detectors, signal heads, communication equipment
Calculating signal intervals - questions and answers-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
camera detection adv/dis - questions and answers-comprehensive data
versatility
integration
flexibility
multipurpose
, cost
weather sensitive
line of sight limitations
privacy concerns
Circuit Breaker Finders - questions and answers-Tool that helps locate the appropriate circuit
breaker or fuse that controls the electrical supply to the area.
common issues signal heads - questions and answers-burned out lights
damage
electrical issues
age/obsolescence
Communication Equipment - questions and answers-communicate with central traffic
management system such as remote monitoring systems or emergency vehicle preemption
systems
components of hawk - questions and answers-ped signal heads
vehicle signal heads
ped push button
crosswalk
components of school zone flashers - questions and answers-flashing beacon
signage
power source
controller/timer
pole/mounting hardware
solar panels(optional)
Concurrent group - questions and answers-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
Conductors - questions and answers-Materials that conduct electricity
Ex. Most metals
Controller - questions and answers-brain. receives input from sensors, processes the info, and
generates output commands. responsible for timing the signal phases, coordinating signals
sequences, and optimizing traffic flow
Coordinated Operation - questions and answers-Intersections synchronized to enhance
progression of vehicles on one or more directional movements in a system
detection issues solutions - questions and answers-regular maintenance/inspection
sensor calibration
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