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What piiitos: has established requirements for PPE in certain working situations? CORRECT SHA/CCOHS Which of the following certifications must be attained first? CORRECT ANSWER: Traffic signal Tech. Level 1 Upgrades or revisions to the traffic signal are the responsibility of whom? ‘CORRECT ANSWER: professional engineer What is NOT an example of documentation that can limit the liability of the technician and/or agency? CORRECT ANSWER: N TCIP What is the single most important focus that the field technician should have? CORRECT ANSWER: safety For many Or ANSI what is the least amount of technicians required to perform work with an aerial lift? What is NOT true when it comes to dealing with the public? (CORRECT ANSWER: If you are unsure of the answer, give them the incorrect information so you can keep working What is NOT a function of a modem traffic signal controller? CORRECT ANSWER: Processing when a vehicle has run a red light and informing the police What was a major drawback with the first traffic signal controllers? CORRECT ANSWER: Maintaining the mechanical parts When did standardization of controllers become established in the United States and Canada? 1970s What was limited by the fourth proprietary connector used with the NEMA TS-1? CORRECT he type of replacement model Which type of controller utilizes a high speed data channel between all major equipment to maximize the functionality and expandability of the controller assembly? CORRECEANSWER! NEMA TS-2 Type 1 What greatly reduced wire connections in the controller cabinet with the use of the RS-485 with the SDLC? CORRECTANSIVERS Bus interface unit What was the intent of developing the ATC specifications? CORRECT ANSWER: ‘o have an open architecture hardware and software platform for ITS application Which agency developed a communications protocol for ITS systems, field devices and software so basic functionality should be interchangeable regardless of the manufacturer? CORRECT ANSWER: N1cIP Before beginning work that requires workers or vehicles to be in or over the roadway, what should traffic signal field technicians ensure is in place? ‘emporary traffic control (TTC) What is NOT a common type of truck used for traffic signal maintenance? CORRECT ANSWER: dump truck Traffic signals can be attached to Mast Ams using which of the following? - disconnect hangers attached to the mast arm which suspend the signal - bracket that is rigidly mounted to the mast arm with a clamping device - pipe mounts that screw into nipples installed directly into the mast arm - ALL of the above CORRECT ANSWER: all of the above Traffic signal supports are NOT used to display the following items: CORRECT ANSWER: advertisements Methods of signal supports include what? CORRECT ANSWER: Truss supports, monotube supports, pedestal supports What is NOT an advantage of attaching signals to mast arms with brackets? CORRECT ANSWER: allow for the signal to "give" in the wind What are the 2 basic types of booms used on bucket trucks? CORRECT ANSWER? articulating and extensible Traffic signals are not always where an aerial lift can be positioned properly. What should you always do when operating aerial lifts? ‘CORRECT ANSWER: Use the stabilizers to provide additional support when the lift is in operation Check for proper operating DC voltage, check for the absence of red on a phase that does not have green, yellow, or walk, check on a simultaneous are functions that are provided by both - ‘MU and MMU What is the purpose of relays in a traffic signal system? CORRECT ANSWER: 10 transfer the outputs from one component to another What device minimizes the amount of voltage that might be available at a pedestrian push button should the button malfunction? CORRECT ANSWERS solator Which of the following combinations would cause the signal to enter flashing mode according to NEMA? CORRECT ANSWER: seen & yl yellow & red walk & yellow What feature is included in the 170 or 2070 monitors vs, the NEMA monitor? CORRECT ANSWER: plug in Which group of features best describes why malfunction monitoring units are more advanced then conflict monitors? thernet connections To avoid injury, at what voltage should a current measurement NOT be attempted on an open circuit? CORRECTANSWER: above the rated voltage of the meter Pertaining to multimeter, what does VOM stand for? CORRECT ANSWER: volvohm meter To make sure that the multimeter does not alter the operation of the circuit when it is used to measure current, the impedance of the meter must be as low as possible. For measurements of around an amp, the resistance of a meter should be what? CORRECT ANSWER: less than an ohm When using the nmltimeter, what step should be completed first? CORRECT ANSWER: ensure that the leads are placed in the correct sockets Most electrical codes require how many ohms to ground for electrical service installations? CORRECT 5 ohms Resistance of meters used to measure current are normally? CORRECT ANSWER: very low What does OTDR mean? CORRECT ANSWER: optical time domain reflectometer In what type of controller is the cycle sometimes called a "dial" because a rotating dial is used to control the timing of the various signal displays? Ider electromechanical List 2 things that describe the vehicle movement made at an intersection? CORRECT ANSWER: direction of approach manuever In usual convention, how are through phases numbered? CORRECT ANSWER: in a clockwise direction starting with phase 2 Some agencies refer to a combination of movements as a phase. This is also true in some older controller assemblies that operate with what maximum amount of phases? When it comes to barriers for dual ring controllers there are barriers, one for leaving street and one for leaving street . major, minor Is this true about an independent overlaps: An independent overlap follows a designated phase CORRECT ANSWER. 10 Parent/child overlaps are the most common type of overlap. The overlap is viewed as the because it is only present when one or more phase is active, which is referred to as the CORRECT ANSWERS cil, paren This left tum phase is defined as "both modes occur on an approach during the same cycle"? CORRECT rotected/ permissive The yellow-red flashing mode provides the same type of control as a 2 way stop control where only the minor streets have a what? top sign In order to ensure fail safe operation , what occurs when a conflict monitor unit (CMU) detects a fault? he flash transfer relays have all of the signals display red What factors might be included in determining the most appropriate time for an all red clearance? -type of vehicular traffic - driver characteristics ~Pedestrian activity - all the choices are correct CORRECT ANSWER: all the choices are correct What is the time relationship determined by the difference between a fixed point in the cycle length and a system reference point? ‘CORRECT ANSWER: oftse What are the components of volume-density signal timings? CORRECT ANSWER: gap reduction What are factors of gap reduction allowing for extension/passage time to be reduced? CORRECT ime to reduce Passage time is a function of: CORRECT ANSWER? distance from the stop line to the detector What should be considered when determining yellow interval timings? CORRECT ANSWER? formula recommendations from the responsible agency engineering judgement What is developed to provide a degree of consistency that should allow traffic to progress through a number of intersection without stopping? ‘affic signal coordination timings ANS are esr programmed as seconds but can also be programmed as what? CORRECT % of the cycle length All phases of a coordinated operation with the exception of "hold" phases are terminated by what? CORRECT ANSWER: force offs What periods control when and over what time duration the controller is allowed to service coordinated phases? missive period Emergency vehicle preemption is designed to do which of the following? CORRECT ANSWER: clears vehicles from the travel path of an emergency vehicle prevent other vehicles from entering the path that the emergency vehicle has taking prevents vehicles from blocking the emergency vehicles path What signal indications can be displayed at a railroad crossing? CORRECT ANSWER: 3 section head with red, yellow & green indications What does NOT need to be considered for drawbridge preepmtion of a traffic signal? CORRECT ANSWER? audible alarms What is NOT a basic component of an optical system? CORRECT ANSWER; isolators What converts electronic data to and from laser light for transmission? CORRECT ANSWER? fiber optic modems What is ODTR CORRECT ANSWER? one trial driven reflectometer Limited channel availability, requires line of sight path between antennae, possible interference due to weather is a (disadvantage or advantage) of microwave communications system disadvantage Why is maintenance documentation so important? CORRECT ANSIERS - to prevent litigation -historical database - planning for spare parts and replacement equipment 
