IMSA level 1 certification Questions And Quality Solutions || 2026/27

Where are you when you install alternating flashing 12" red lights? - CORRECT ANSWER At a railroad crossing. Who determins the the standards on traffic control devices and sets the requirements for uniformity? - CORRECT ANSWER The Manual on uniform traffic control devices, (MUTCD). What is the the voltage that a traffic signal cabinet needs to run all its components? - CORRECT ANSWER 120 volts AC Where are you when you come across a signal that has a ped pole on each side of the road, each having a 3 section signal on top followed with a 2 section mounted directly under neath? - CORRECT ANSWER A ramp meter on a ramp to a highway. What is a flashing signal along the road called? - CORRECT ANSWER A flashing beacon. What is the definition of short term work zone as per the MUTCD? - CORRECT ANSWER 1 hour or less What's OSHA? - CORRECT ANSWER Occupational and safety health administration Can you get your level III certification and what are they? - CORRECT ANSWER Yes, and it's for bench and field electrician I'm working near power lines where would I get my clearance from? - CORRECT ANSWER CEC, NEC, NESC What are the three basic types of beacons? - CORRECT ANSWER Stop sign beacon, warning beacon, and flashing beacon. What is the difference between concurrent and sequential phases? - CORRECT ANSWER Concurrent phases, phases that run together. Sequential phases, are phases that run one at a time. I have a dual ring controller and all my through phases are even, what do I mean? - CORRECT ANSWER The dual ring phases are 2,4,6,8 What is the cheapest way to coordinate a corridor of signals? What needs to stay the same throughout the day? - CORRECT ANSWER Time based coordination, and cycle length. Explain the white walking man, the flashing orange hand on a ped head and how is this time figured? - CORRECT ANSWER The white walking man is the ped head walk interval, and the ped change clearance interval is the flashing orange hand. What makes up the green interval? - CORRECT ANSWER Initial green time, passage/extension/gap time, and max green time. At most intersections what are phases 2,6 called, and phases 4,8 called - CORRECT ANSWER Phases 2,6 are called Main Street, and 4,8 are called side street. Name the three traffic signal systems? - CORRECT ANSWER Closed loop, central computer, hybrid systems. If phase 2 is in recall what will the controller do? - CORRECT ANSWER The controller will service that phase even if there is no need for it. What happens after the green interval and before the red interval, and how is this change interval figured? - CORRECT ANSWER Yellow interval, and is figured by using the approach speed of the traffic. What is an offset? - CORRECT ANSWER The time it takes from the start of the green interval in a coordination timed intersection and a system reference point along side the road. The controller in a coordinated plan has a call on the side street what can it do to service that call? - CORRECT ANSWER It can use the force off command to end the current phase to service the side street. What is the disadvantage of a span intersection? - CORRECT ANSWER Taller support poles. What is the disadvantage of mast arm supports? - CORRECT ANSWER Higher cost. What is the minimum number is heads for Main Street direction? - CORRECT ANSWER Must have a minimum of 2 signal heads. 12" signal heads can be used without side a pole support heads on a ____ to a _____ intersection? - CORRECT ANSWER Minimum 40 foot maximum 120 foot intersection. The a.d.a of 1990 ensures no discrimination against people who have disabilities? - CORRECT ANSWER True. Are pull/ junction boxes only used where wire needs to change direction? - CORRECT ANSWER No What is used to shade signal indications from the sun and allow it be seen from the lane intended? - CORRECT ANSWER Visors. Signal heads that are _________ are to only be seen from a specific area on the road? - CORRECT ANSWER Visibility limited. ____ assemblies provide the maximum support length to cross over a street? - CORRECT ANSWER Truss type assemblies. You can use the same type signal head _______ on a mast arm and truss supports? - CORRECT ANSWER Mounting hardware. Long life and low power consumption is a major advantage for _____ lamps? - CORRECT