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IMSA LEVEL 1, Imsa traffic tech 1,
IMSA level 1 certification, IMSA Signal
Technician Level 1 End of Chapter
Questions, ISMA Traffic Signal
Technician II, Work Zone Temporary
Traffic Control Tech Pre-Quiz
What is negligence? - CORRECT ANSWER ✔✔✔ Failure to use reasonable care in one's actions What are considered low-voltage gloves? - CORRECT ANSWER ✔✔✔ Class 00 or 0 What class of gloves would you use for 15K volts AC? - CORRECT ANSWER ✔✔✔ Class 2 Before use, every glove should be? - CORRECT ANSWER ✔✔✔ Field tested The first thing that can lead to a legal issue when working on the roadway? - CORRECT ANSWER ✔✔✔ Improper traffic control High traffic area? - CORRECT ANSWER ✔✔✔ Arterials streets and multiple lanes of travel Low traffic areas? - CORRECT ANSWER ✔✔✔ Collect streets, typically, narrow and single lanes of travel OSHA mandates that you must maintain a minimum of how many feet clearance from overhead powerlines? - CORRECT ANSWER ✔✔✔ 10ft What is an electrical explosion with a tremendous amount of pressure and heat? - CORRECT ANSWER ✔✔✔ Arc flash What must you do before you dig? - CORRECT ANSWER ✔✔✔ Call digalert Electricity flowing through wires is similar to? - CORRECT ANSWER ✔✔✔ Water flowing through a pipe What is ohms law? - CORRECT ANSWER ✔✔✔ E=IXR What is E in Ohms law? - CORRECT ANSWER ✔✔✔ Voltage and it's is measured in volts What is I in Ohms law? - CORRECT ANSWER ✔✔✔ Current and it measured in amps What is R in Ohms law? - CORRECT ANSWER ✔✔✔ Resistance and it's measured in ohms
If electricity is like water flowing through a pipe voltage is like? - CORRECT ANSWER ✔✔✔ Water pressure Current is like? - CORRECT ANSWER ✔✔✔ The amount of water flowing through a pipe Resistance is like? - CORRECT ANSWER ✔✔✔ The size of the pipe Power is like? - CORRECT ANSWER ✔✔✔ The amount of energy consumed Rules for series circuits? - CORRECT ANSWER ✔✔✔ Current is constant, voltage drops across each load, resistance add up from each load, power adds up from all the loads Rules for parallel circuits? - CORRECT ANSWER ✔✔✔ Voltage is constant, current adds up from each branch, resistance reciprocate from all the loads, power adds up from all the loads Rules from combination circuits? - CORRECT ANSWER ✔✔✔ Series rules for the series load and parallel rules for parallel loads What is bonding? - CORRECT ANSWER ✔✔✔ Connecting conductive objects together by means of all conductors so they are at the same potential What is grounding? - CORRECT ANSWER ✔✔✔ Connecting a conductor or electrical device to the Earth What is a traffic signal warrant? - CORRECT ANSWER ✔✔✔ A condition that an intersection must meet to justify a signal installation What is a signal phase? - CORRECT ANSWER ✔✔✔ A group of controller, timing intervals, and setting used to control one movement of traffic at a signalize intersection What traffic movements are even phases? - CORRECT ANSWER ✔✔✔ Thru movement What traffic movements are odd Phases? - CORRECT ANSWER ✔✔✔ Left term movements What is a ring? - CORRECT ANSWER ✔✔✔ Two or more sequentially time conflicting phases An 8 phase intersection has how many rings? - CORRECT ANSWER ✔✔✔ 2 What is a barrier? - CORRECT ANSWER ✔✔✔ An interlock in a multi-ring controller, or compatibility line, phases on one side of the barrier will never operate with phases on the other side of the barrier What is a concurrent phase? - CORRECT ANSWER ✔✔✔ Can be on with another phase in its concurrent group i.e 1&5 or 2& How many concurrent groups are in a 8 phase intersection? - CORRECT ANSWER ✔✔✔ 2, one group for North and south and one group for east and west
How many basic types of controllers? - CORRECT ANSWER ✔✔✔ 6 Wall controller uses tiles that are equipped with key that activates a switch? - CORRECT ANSWER ✔✔✔ Electro mechanical Who created the first traffic signal standards? - CORRECT ANSWER ✔✔✔ NEMA What Nima standards is the advanced standards for traffic signal control controllers? - CORRECT ANSWER ✔✔✔ NEMA TS What controller has open architecture, hardware, and software platforms to support a wide variety of ITS applications? - CORRECT ANSWER ✔✔✔ Advanced transportation controller (ATC) What device is the brain of the traffic signal system? - CORRECT ANSWER ✔✔✔ Controller What device receives input from sensors, processors the information and then generates an output command? - CORRECT ANSWER ✔✔✔ Controller What are the two purposes of a CMU/MMU? - CORRECT ANSWER ✔✔✔ Signal monitor and voltage monitor What device in a NEMA cabinet facilities, communications between the field terminals, the detection devices and the MMU? - CORRECT ANSWER ✔✔✔ Bus interface unit (BIU) What device in a ATC cabinet, facilities, communication, communications, and data exchange between the controller and the other devices in the cabinet? - CORRECT ANSWER ✔✔✔ Serial interface unit (SIU) What device is an interface between the controller and the field signals? - CORRECT ANSWER ✔✔✔ Load switch, it's receives 24 VDC From the controller and outputs 120 to field signals. What device is ATC cabinet can function as a low switch and flasher? - CORRECT ANSWER ✔✔✔ High density switch pack What electrical switching device controls the flashing mode of the traffic signal? - CORRECT ANSWER ✔✔✔ Flash transfer relay (FTR) What device alternates to flashing 120 VAC output to the signal indication? - CORRECT ANSWER ✔✔✔ Flasher When a signal is put into flash, which device cuts AC power to the load switches? - CORRECT ANSWER ✔✔✔ Mercury contactor, it's purpose is to supply power to the load switches during normal power Every traffic signal project begins with? - CORRECT ANSWER ✔✔✔ Approved traffic, signal plan and special provisions Once construction is complete the red line plans become? - CORRECT ANSWER ✔✔✔ As-built plans
When working with overhead equipment what is a minimum clearance from electrical lines? - CORRECT ANSWER ✔✔✔ 10ft IMSA 7- conductor cable has what color conductors? - CORRECT ANSWER ✔✔✔ Black, white, red, green, orange, blue, white with black What must be done to a mast arm pole upon installation to counteract the force applied? - CORRECT ANSWER ✔✔✔ Raked (leaned back) What is a traffic signal head? - CORRECT ANSWER ✔✔✔ Visible indicators that display the signal aspects to road users MUTCD says a RED indication is? - CORRECT ANSWER ✔✔✔ STOP YELLOW means? - CORRECT ANSWER ✔✔✔ The associated green is being terminated. How many primary signal faces shall be provided for the through movement? - CORRECT ANSWER ✔✔✔ Two What are three common reasons a traffic signal indicates goes dark? - CORRECT ANSWER ✔✔✔ Power outage, burnt out LED, damage or vandalism. What is the purpose of the visor of a traffic signal head? - CORRECT ANSWER ✔✔✔ Shield the signal from direct sunlight or other environmental elements that can hinder the clarity of the signal. A cantilever structure would be found in a? - CORRECT ANSWER ✔✔✔ A span wire signal What supports the signal heads, signal, cabling, signs, detection devices, and other fixtures on a span wire signal? - CORRECT ANSWER ✔✔✔ Messenger wire Per the MUTCD, what is the melting height of traffic signal over the roadway? - CORRECT ANSWER ✔✔✔ 15' to the bottom of the signal head and 25'-6" to the top of the signal head Per the MUTCD, what horizontal distance must be maintained from the face of the curb for side of post signal head mounted less than 15 feet vertically - CORRECT ANSWER ✔✔✔ 2 feet Per the MUTCD, what is the minimum horizontal mounting distance of overhead signal heads? - CORRECT ANSWER ✔✔✔ 8 feet The efficiency of traffic signals is highly dependent on? - CORRECT ANSWER ✔✔✔ Vehicle detection Vehicle detection takes place primarily in what three areas? - CORRECT ANSWER ✔✔✔ Stock bar, advance, system detection What is a system detection used for? - CORRECT ANSWER ✔✔✔ Used on the departure side of intersection to collect traffic data
What type of signal is allowed to be dark if it is sitting in idle? - CORRECT ANSWER ✔✔✔ HAWK Signal What is the purpose of a school zone flasher? - CORRECT ANSWER ✔✔✔ Alert drivers to slow down Responding to a signal that is flashing red what do you check first? - CORRECT ANSWER ✔✔✔ CMU for faults Responding to a blacked out intersection, what is the first thing you check? - CORRECT ANSWER ✔✔✔ Cabinet voltage Responding to oversize load, what should you verify for best alternative route? - CORRECT ANSWER ✔✔✔ Route, dimensions, height, width and weight After determining the battery back up is not operational, what should you do first before connecting to a generator? - CORRECT ANSWER ✔✔✔ Disconnect the main electrical service. When responding to damage buried cable conductors, the first thing to do is? - CORRECT ANSWER ✔✔✔ Identify the damage, conductors or cables Tether wires - CORRECT ANSWER ✔✔✔ Support the bottom of the signal head and reduces the effect of them swinging in the wind Splashover - CORRECT ANSWER ✔✔✔ Loop sensitivity should be turned down if it is detecting vehicle in adjacent lanes Loops - operation concerns - CORRECT ANSWER ✔✔✔ Cross talk may be solved by grounding the drain wire in the home run cable Crosstalk - CORRECT ANSWER ✔✔✔ Electrical interference, causing false calls, multiple calls, or no call situations. Ped button clearance - CORRECT ANSWER ✔✔✔ If acces is obstructed, the affected phase should be placed on pet recall until access is cleared. Ped button - CORRECT ANSWER ✔✔✔ When testing any pedestrian button verify if it is placing a call to the controller. Offset - CORRECT ANSWER ✔✔✔ The last thing you always do before leaving a traffic signal cabinet, is to verify the date and time in the controller and monitor is so equipped What best describes a barrier? - CORRECT ANSWER ✔✔✔ An interlock in a multi ring controller Series circuit - CORRECT ANSWER ✔✔✔ Current remains the same throughout all components Voltage - CORRECT ANSWER ✔✔✔ It's like water pressure Current - CORRECT ANSWER ✔✔✔ It's like the amount of water flowing
Resistance - CORRECT ANSWER ✔✔✔ It's like the size of the pipe Power - CORRECT ANSWER ✔✔✔ Is the amount of energy consumed Isolation panel - CORRECT ANSWER ✔✔✔ Inspect the ________ to ensure the signal is sent from the push button to the controller What should you do first before preforming duties in the proximity of overhead power lines? - CORRECT ANSWER ✔✔✔ They must communicate with the power company prior to starting the work and coordinate the activities that a representative of the power company can be in attendance to assist while the work is being performed Electrical lines buried underground present the same potential for danger as overhead lines - CORRECT ANSWER ✔✔✔ True Typical equipment you use for a overhead traffic signal installationand maintenance? - CORRECT ANSWER ✔✔✔ Typical equipment for above ground includes bucket trucks plat form lift trucks boom trucks and cranes When should a full body Harness be worn - CORRECT ANSWER ✔✔✔ Whenever a technician is on any type of aerial lift equipment Where does the Full body harness straps around? - CORRECT ANSWER ✔✔✔ It straps around the legs and shoulder of the technician and is tethered to the lift arm of the aerial equipment Workers must be aware of what? - CORRECT ANSWER ✔✔✔ The location of utilities that cannot be readily seen including what type they are and the potential for danger that they possess. The contractors should notify who before beginning excavation? - CORRECT ANSWER ✔✔✔ Notify all known utility owners prior to beginning excavation What is the most common underground utilities that might be encountered doing construction for traffic signals? - CORRECT ANSWER ✔✔✔ Gas and pressurized water and sewer lines. Workers are responsible not only for ensuring their own safety in the work environment but also? - CORRECT ANSWER ✔✔✔ Need to ensure that the traveling public is safe What is most commonly use besides traffic control plan? - CORRECT ANSWER ✔✔✔ Commonly known as maintenance of traffic plan What's is MOT plan? - CORRECT ANSWER ✔✔✔ Maintenance of traffic plan Workzone signs need to be done regardless of how short the activity. Is expected to be. True or false - CORRECT ANSWER ✔✔✔ True Hazardous underground utilities:
Contributory negligence is? - CORRECT ANSWER ✔✔✔ To conduct which falls below the standard of care that a person is legally required to exercise for his own safety and this failure is contributing cause to injury or damage that he suffered What does NEC stand for? - CORRECT ANSWER ✔✔✔ National Electrical Code What does NESC stand for? - CORRECT ANSWER ✔✔✔ National Electric Safety Code What did CEC stand for? - CORRECT ANSWER ✔✔✔ Canadian Electric Code What are the color intervals during HAWK when a pedestrian crosses? - CORRECT ANSWER ✔✔✔ (Flashing)CIRCULAR yellow signal,(Steady) CIRCULAR yellow signal, followed by (Both Steady) CIRCULAR RED during the pedestrian walk interval. Followed by alternating (flashing ) CIRCULAR RED The voltage that the signals operate on are? - CORRECT ANSWER ✔✔✔ (120 VAC ) 120 VAC (Volts Alternating Current) is capable of what? - CORRECT ANSWER ✔✔✔ Serious or fatal injury Many agencies prohibit technicians from working above what? - CORRECT ANSWER ✔✔✔ Above an open lane of traffic What is the primary difference between short term work zone and one that will be of a longer duration? - CORRECT ANSWER ✔✔✔ Is there the traffic control devices place to establish the work zone require a degree of maintenance that is not necessary in the short term work zone Traffic signal engineer in design construction installation and maintenance procedures are governed by what? - CORRECT ANSWER ✔✔✔ Specific standards and specifications MUTCD establishes what? - CORRECT ANSWER ✔✔✔ The purposes of traffic control devices and the requirements for uniformity of traffic control devices throughout the United States What is MUTCDC? - CORRECT ANSWER ✔✔✔ Manual on uniform traffic control devices Canada Who is responsible for developing and publishing the MUTCD in the United States - CORRECT ANSWER ✔✔✔ The federal highway administration (FHWA) MUTCD contains four type of sentences? What are they? - CORRECT ANSWER ✔✔✔ Standards, guidance, options,support Traffic control signals are usually installed why? - CORRECT ANSWER ✔✔✔ Because a large volume of conflict in traffic makes it necessary to alternate the traffic movements that are directed to stop and allowed to proceed Traffic control signals are usually placed at locations where __________? - CORRECT ANSWER ✔✔✔ Where to public streets intersect with each other or where high value private driveways intersect with a major street
How many legs does the signalized intersection have? - CORRECT ANSWER ✔✔✔ Four legs (four-way intersections) How many legs does a T intersection have? - CORRECT ANSWER ✔✔✔ Three legs Midblock pedestrian signal is placed where? - CORRECT ANSWER ✔✔✔ At a marked crosswalk in the middle of a block or between two intersections where there is no minor street or driveway ( School zones and heavy urbanized areas) Midblock pedestrian signals usually have standard three section traffic signals facing the vehicles on the street with the circular green indications displayed until a pedestrian interrupts the controller operation by activating a pedestrian detector? True or false? - CORRECT ANSWER ✔✔✔ True A new option for mid block pedestrian signals? - CORRECT ANSWER ✔✔✔ "Pedestrian hybrid beacon" sometimes called high intensity actuated crosswalk or hawk Emergency vehicle signals are usually located at where? - CORRECT ANSWER ✔✔✔ At or near the exit of the fire station or other facility that houses emergency response vehicles What is the size for emergency vehicle traffic control signals? - CORRECT ANSWER ✔✔✔ 12 inch diameter for sturdy red and steady yellow circular signal indications and any arrow indications and 8 inch diameter for green or flashing yellow circular signal indications When the pedestrian signal Head display a upright hand ( what does It symbolize? - CORRECT ANSWER ✔✔✔ Don't walk When should the uprise hand( don't walk) be displayed? - CORRECT ANSWER ✔✔✔ When the pedestrian hybrid beacon Face either dark or displays Flashing or Steady yellow When should the walking person symbol be displayed? - CORRECT ANSWER ✔✔✔ When the pedestrian hybrid beacon faces are displayed Steady circular red signal When should the pedestrian signal head display a flashing up rise hand? - CORRECT ANSWER ✔✔✔ When the pedestrian hybrid beacon faces are displayed alternating flashing circular red signal Upon pedestrian clearance the pedestrian signal head reverts to which display? - CORRECT ANSWER ✔✔✔ Steady uprise hand Upon activation by authorized emergency personnel the emergency vehicle hybrid beacon faces shall display what? - CORRECT ANSWER ✔✔✔ Should each display a flashing yellow signal indication followed by a steady yellow change interval prior to displaying two circular read signal indicatates in alternating flashing array When should the alternating flashing red signal indications be displayed in emergency vehicle hybrid beacon? - CORRECT ANSWER ✔✔✔ Only be displayed
What are temporary signals used for? What situation? - CORRECT ANSWER ✔✔✔ - In conditions where one lane one-way traffic's required
- where slow moving construction vehicles enter or
- cross the roadway for a limited period of time when improvements are being made. Or when the signal is knocked down or damage during an accident or weather event What are flashing beacons? - CORRECT ANSWER ✔✔✔ highway traffic signals with one or more signal sections that operate in a flashing mode The most common beacon is? - CORRECT ANSWER ✔✔✔ The (Flashing beacon )that is used at intersections they have not met the criteria established for installation for a full traffic control signal What are other types of beacons? - CORRECT ANSWER ✔✔✔ Warning beacons ( flashing circular yellow indications and stop beacons ( flashing circular red indication The MUTCD states " in intersection control beacon show consist of what? - CORRECT ANSWER ✔✔✔ One or more single face is directed toward each approach to an intersection. Each beacon Signal face consist of one or more signal sections of a standard traffic signal face with what.? - CORRECT ANSWER ✔✔✔ (CIRCULAR YELLOW & CIRCULAR RED ) Single indications in each single face Beacons shall be installed and used only at? - CORRECT ANSWER ✔✔✔ And intersections to control two or more directions of travel Flashing circular yellow beacon light are installed , but they_____ - CORRECT ANSWER ✔✔✔ Must not face conflicting vechicular approaches Where is a lane use control signals? - CORRECT ANSWER ✔✔✔ Are special overhead signals the permit or prohibit the use of specific lanes of history or highway all the indicate the impending prohibition have their use. The most common application of lane use control signals are? - CORRECT ANSWER ✔✔✔ (Reversible lane control )and sometimes used in (nonreversible freeway lane ) application. What are the special signal faces for Lane use control signals? - CORRECT ANSWER ✔✔✔ Red X symbols and yellow or green down arrow symbols Supplementary signs are sometimes used to explain what on "Lane Use Coltrol Signals"? - CORRECT ANSWER ✔✔✔ Their meaning and intent Lane use control signals may be used on what? - CORRECT ANSWER ✔✔✔ 1) more than one lane is reversed in direction
- two way or one way left turns or allowed during peak period Reversible operations but those turns are from a different lane than used during off peak period
- other unusual or complex operations are included in the reversible lien pattern
- An emergency study indicates that the safety and efficiency of the traffic operations of a reversible Lane system will be improved by Lane use control signal
- Demonstrated crash experience occurring with reversible lane operations controlled by static signs that can be corrected by using lane use control signals at the times of transition between peak and off-peak patterns A system of lane use control signals must be coordinated with each other because why? - CORRECT ANSWER ✔✔✔ So that they are operated uniformity and consistently What is a toll plaza signal? - CORRECT ANSWER ✔✔✔ It's a multiple lanes where one or more lanes is sometimes closed to traffic,a lane use control signal shall be installed above the center of each toll plaza lane to indicate the open or close status of the control the lane. What is a traffic signal cycle or other words ( cycle length)? - CORRECT ANSWER ✔✔✔ Is the total elapsed Time between the start of a specific display until that display comes up again The cycle is sometimes referred to as a? & why? - CORRECT ANSWER ✔✔✔ " Dial" & because a rotating dial is used to control the timing of the various signal displays What is the traffic signal phase? - CORRECT ANSWER ✔✔✔ Commonly associated with the specific assigned timing function in the traffic signal controller If an intersection that has four through phases and four left turn faces is to be in? - CORRECT ANSWER ✔✔✔ Eight phase intersectionq What are the "1-8 even phase numbers " asign too? - CORRECT ANSWER ✔✔✔ Through movements What " phases" are the major-street through movements? - CORRECT ANSWER ✔✔✔ Phases 2 and 6 Odd Numbers are assigned to what "phase " - CORRECT ANSWER ✔✔✔ Left turn phases An intersection that has four through phases and four left turn faces is what? - CORRECT ANSWER ✔✔✔ Said to be in "eight phase intersection" What is a interval? - CORRECT ANSWER ✔✔✔ Is the amount of time that a particular indication is giving during a phase What is a "rings"? - CORRECT ANSWER ✔✔✔ is a serious of conflicting phases that occur in an established order, but can never occur simultaneously ( in the same time) with each other.
3)the detection area placement is more flexible because it can be curved or angled to accommodate different geometric configurations of approach lanes. What the disadvantages of inductance loops? - CORRECT ANSWER ✔✔✔ 1) loops can be damaged or broken in geographic areas where freezing and thawing causes the pavement to crack
- loops can also be damaged when trench is made in the pavement for the utility installation or repairs
- loop installation and maintenance requires closure of travel lanes Principle components of an inductive loop detectors system include? - CORRECT ANSWER ✔✔✔ One or more turns of insulated wire wound in a saw slot in the pavement; A lead in cable from the loop to the controller cabinet and a detector electronics unit (amplifier) Inside the cabinet When a vehicle passes over the loop or is stopped on the loop the decreases what? - CORRECT ANSWER ✔✔✔ Inductance of the loop Inductance loops work like? - CORRECT ANSWER ✔✔✔ A metal detector as they measure the change in the field when object pass. The most common loop warrior sizes range between? What? - CORRECT ANSWER ✔✔✔ #12 AWG & #16 AWG the acronym of AWG stand for? - CORRECT ANSWER ✔✔✔ American wire gauge What is the standard of "American wire gauge "? - CORRECT ANSWER ✔✔✔ is a standardized wire gauge system used since 1857 for the diameters of round, solid, nonferrous, electrically conducting wire. (American Society for Testing and Materials) Loop wires are typically installed in? - CORRECT ANSWER ✔✔✔ Slots cut into the roadway with a pavement saw Loops sensitivity is what? - CORRECT ANSWER ✔✔✔ A measure of the amount of inductance Change caused by the presence of a vehicle may decrease base on the debt into the pavement that the loop is buried What's another loop detector? - CORRECT ANSWER ✔✔✔ Performed loop The shape Of a performed loop are? - CORRECT ANSWER ✔✔✔ Sometimes circular in shape like a hula hoop before they are placed in the roadway The performed loop requires? - CORRECT ANSWER ✔✔✔ A wider slot in the pavement and they require a circular slot which is harder to cut. Loop wires are protected by what? - CORRECT ANSWER ✔✔✔ An protective layer and there are likely to fail or break then non-perform loops What kind of components does a loop lead in cable have? - CORRECT ANSWER ✔✔✔ • outer jacket
- shield •. conductors •. Drain The loop lead in cable which is terminated on the loop detector panel in the single control cabinet is the portion of what? - CORRECT ANSWER ✔✔✔ the portion of the loop detector assembly that connects the loop wires to the controller cabinet Video image detection systems are to? - CORRECT ANSWER ✔✔✔ Detected vehicles at signalized intersections Video imaging detection system equipment include? - CORRECT ANSWER ✔✔✔ Video camera A monitoring and image storage module Detection modules A programming device and it software Cable between the camera and the video image processor Peripheral equipment The video image processor is used to? - CORRECT ANSWER ✔✔✔ Detect the presence of vehicles in optical detection zones. The advantages of video detection systems are? - CORRECT ANSWER ✔✔✔ - Capable of operation during roadway maintenance or construction activities such as milling and resurfacing Can provide video images to a remote location for traffic monitoring purposes Can be used for incident assessment and management in addition to vehicle detection. The disadvantages of video detection systems are? - CORRECT ANSWER ✔✔✔ May involve a higher installation cost Maintenance personnel require advanced technical training The basic components of video detection camera? - CORRECT ANSWER ✔✔✔ Camera, filter, lens enclosure,and sun shield How many video cameras most intersections have? - CORRECT ANSWER ✔✔✔ One camera per approach may be sufficient.
the acronym for ADA stands for? - CORRECT ANSWER ✔✔✔ Americans with disabilities Act of 1990 What's is ADA ( Americans with disabilities Act of 1990? - CORRECT ANSWER ✔✔✔ Requirements ensuring equal opportunity for persons with disabilities in employment state and local government services public Accommodation commercial facilities and transportation. the acronym for CMS stands for? - CORRECT ANSWER ✔✔✔ Changeable message sign What is Changeable message sign? - CORRECT ANSWER ✔✔✔ Also known as variable message sign (VMS) and dynamic message sign (DMS). CMS are traffic control devices used for traffic warning , regulation routing and management and are designed to affect the behavior of the motorist by providing real time highway related information. What is beacon? - CORRECT ANSWER ✔✔✔ A highway traffic signal with one or more signal sections that operates in a flashing mode the acronym for EEO stands for? - CORRECT ANSWER ✔✔✔ Equal employment opportunity Equal employment opportunity is for what? - CORRECT ANSWER ✔✔✔ Prohibits specific types of job discrimination in certain workplaces ( US department of labor) the acronym for ITS stands for? - CORRECT ANSWER ✔✔✔ Intelligent Transportation systems Intelligent Transportation systems is used for what? - CORRECT ANSWER ✔✔✔ Improves transportation safety and mobility and enhances productivity through the use of advanced information and communication technologies. ITS encompass a broad range of witless and wire line communications based information and electronics technologies. What is a minor street? - CORRECT ANSWER ✔✔✔ The street normally carrying the lower volume of vehicular traffic What is a platoon? - CORRECT ANSWER ✔✔✔ A group of vehicles or pedestrians traveling together as a group either voluntarily or involuntarily because of traffic signal controls, geometrical or other factors What is a preemption control? - CORRECT ANSWER ✔✔✔ The transfer of normal operation of a traffic control signal to a special control mode of operation What is a Queue length? - CORRECT ANSWER ✔✔✔ Numbers of vehicles stopped or are slowly moving in a line where the movement of each vehicle is constrained by that of the lead vehicle What is a signal warrant? - CORRECT ANSWER ✔✔✔ A threshold condition that if found to be satisfied as part of an engineering study, shall result in analysis of other
traffic conditions or factors to determine whether a traffic control signal or other equipment is justified. What is split? - CORRECT ANSWER ✔✔✔ A division of the cycle length allocated to each of the various phases What is split phasing? - CORRECT ANSWER ✔✔✔ Serving a intersection one approach at a time Traffic signal supports are what? - CORRECT ANSWER ✔✔✔ Items of equipment that provide an elevated component to which the traffic signal heads or displays are attached What are most common types of overhead signs that can be displayed in signal supports? - CORRECT ANSWER ✔✔✔ Signal heads , regulatory signs , guide signs, overhead street name signs Two common terms associated with traffic signal supports and signal head are? - CORRECT ANSWER ✔✔✔ "Rigid " and free swinging Typically signal heads mounted on "span wire " assemblies are called? - CORRECT ANSWER ✔✔✔ "Free swinging" Typically signal heads mounted on pedestals or steel structures have what kind of mounting? - CORRECT ANSWER ✔✔✔ "Rigid " A "mast arms signal supports" is an assembly that typically includes what? - CORRECT ANSWER ✔✔✔ A concrete foundation, a steel upright pole and a steel" arms that is attached to the upright pole. Typically the coastal areas require in mast arms supports? - CORRECT ANSWER ✔✔✔ Much heavier steel, welds, connection bolts and foundations that those more inland and in central states Mast arms structures are typically made of? - CORRECT ANSWER ✔✔✔ Steel with galvanized finish to inhibit rust and corrosion Several agencies have adopted what for mast arms? - CORRECT ANSWER ✔✔✔ Have adopted colored finishes for aesthetic reason. Finishes are typically painted on, or in some instances are applied as a powder coat finish over the galvanized finish What are some advantages for mast arm signal supports? - CORRECT ANSWER ✔✔✔ Less maintenance is required. Signal heads do not sag over time or sway in high winds as they do when suspended on span wires High wind loading capabilities than span wires in coastal area that experience high winds including tropical storms and hurricanes
