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IMSA level 1 certification actual solution.docx
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Where are you when you install alternating flashing 12" red lights? - answer ✅✅At a railroad crossing. Who determins the the standards on traffic control devices and sets the requirements for uniformity? - 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? - 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? - answer ✅✅A ramp meter on a ramp to a highway. What is a flashing signal along the road called? - answer ✅✅A flashing beacon. What is the definition of short term work zone as per the MUTCD? - answer ✅✅1 hour or less What's OSHA? - answer ✅✅Occupational and safety health administration Can you get your level III certification and what are they?
and the ped change clearance interval is the flashing orange hand. What makes up the green interval? - 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 - answer ✅✅Phases 2,6 are called Main Street, and 4,8 are called side street. Name the three traffic signal systems? - answer ✅✅Closed loop, central computer, hybrid systems. If phase 2 is in recall what will the controller do? - 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? - answer ✅✅Yellow interval, and is figured by using the approach speed of the traffic.
What is an offset? - 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? - 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? - answer ✅✅Taller support poles. What is the disadvantage of mast arm supports? - answer ✅✅Higher cost. What is the minimum number is heads for Main Street direction? - answer ✅✅Must have a minimum of 2 signal heads.
You can use the same type signal head _______ on a mast arm and truss supports? - answer ✅✅Mounting hardware. Long life and low power consumption is a major advantage for _____ lamps? - answer ✅✅LEDs The ___ wire keeps signal heads from swinging in the wind? - answer ✅✅tether Span conductor wires are exposed to the weather 24/7? T or f? - answer ✅✅True __________ are used to warn the traveling public of any changes or work on the road ahead, they are also known as variable/dynamic message signs? - answer ✅✅Changeable message signs The last step before an intersection is ready for ____ is to have the inspectors, local agencies, and the contractor meet for the final okay. - answer ✅✅Stop and go operation
What are the two indications on a ped head and their colors? - answer ✅✅Walking man - white, upraised hand - Portland orange A loop detector sends a message to the controller's input file because it ____ (increases or decreases) the inductance frequency. - answer ✅✅Decreases There are __ (Two or three) turns of wire in a standard loop that is 6' x 20' - answer ✅✅Three Would a solar detector be a common way to detect for traffic at a traffic signal? Yes or no? - answer ✅✅No List three ways Doppler microwave detectors can check for vehicles? - answer ✅✅Volume, occupancy, classification For one to maintence_____ you must close the lane of travel. - answer ✅✅Loop detectors
