ISMA Traffic Signal Technician II EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2024/2025 | SCORED A+

ISMA Traffic Signal Technician II EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2024/2025 | SCORED A+. Three main categories of safety a traffic signal technician is responsible for? - CORRECT ANSWER - Safety of motorist and pedestrians His or her own personal safety Safety of public and personal property Traffic signal field technicians perform several maintenance and repair functions above the ground and roadway typically using what two vehicles? - CORRECT ANSWER - Bucket Truck Aerial lift (platform truck) While using a bucket truck or aerial lift what implement provides proper protection for the user? - CORRECT ANSWER - Protective Harness What responsibilities (liability) does a Traffic signal technician have while involved in repair, testing or maintenance? - CORRECT ANSWER - Legal liability Dealing with the public It is imperative that the traffic signal field technician maintain comprehensive what of all the steps taken during repair and maintenance of traffic signals? - CORRECT ANSWER - Documentation What two instances are documentation required for a traffic signal field technician? - CORRECT ANSWER - Routine maintenance Emergency repair ISMA Traffic Signal Technician II EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2024/2025 | SCORED A+ The "word" public usually represents the following individuals (4): - CORRECT ANSWER - Road users Area residents / Property owners Elected and appointed officials The media Several means of public interaction are (3): - CORRECT ANSWER - Mail or email Telephone contact Face to face meetings When dealing with the public, keep in mind that the routines of public users may be disrupted for periods of time during construction. How should a traffic signal field technician interact with the public? (5) - CORRECT ANSWER - Always be polite Be confident when speaking Communicate clearly in understandable terminology Don't argue or threaten Don't provide information if you are uncertain of its accuracy. Traffic signal controller units of todays traffic systems are controlled by what? - CORRECT ANSWER - Microprocessor The microprocessor is programmed to recognize what? - CORRECT ANSWER - Input requests from vehicle detection systems A microprocessor takes appropriate action to control intersection what? - CORRECT ANSWER - Timing A forerunner of the electronic controllers that we have today was the? - CORRECT ANSWER - Electromechanical controller What year where solid state electronic controllers developed to replace the electro-mechanical controllers? - CORRECT ANSWER - 1970's What two improvements differentiated electronic controllers from electro-mechanical controllers? - CORRECT ANSWER - More dependable Added many more features What was the standardization that primarily established a pin configuration in the controller and defined a function for every pin? - CORRECT ANSWER - NEMA TS-1 The NEMA TS-1 has three connectors which where known as: - CORRECT ANSWER - A,B, and C connectors NEMA TS-1 had how many connectors? - CORRECT ANSWER - Three The NEMA TS-1 defined every pin for each connector as either what two connection types? - CORRECT ANSWER - Input or Output NEMA also allowed manufactures to add an additional feature on the fourth connector. What was this connector know as? - CORRECT ANSWER - D connector What was the D connector commonly used for? - CORRECT ANSWER - Communications Pre-emption Other special features What three agencies joined together to help develop the 170 controller? - CORRECT ANSWER - California DOT City of Los Angeles California New York State DOT What controller is an open-architecture based general purpose microcomputer for traffic control? - CORRECT ANSWER - Model 170 controller What two specifications does the model 170 controller require? - CORRECT ANSWER - A specific hardware architecture A specific processor How is the Type 179 controller specification similar to the 170 specification?(2) - CORRECT ANSWER - Open architecture Allows for interchangeability of components What is the primary difference between the 179 and 170 controller - CORRECT ANSWER - Uses a different microprocessor Who developed the model 2070 controller? - CORRECT ANSWER - CALTRANS The 2070 was introduced to supersede which controller? - CORRECT ANSWER - The 170 controller Which controller is compatible regardless of the manufacturer? - CORRECT ANSWER - The 2070 controller The 2070 provides more functionality than the 170 because of what features?(3) - CORRECT ANSWER - Additional processing power Ability to program in higher level languages Multiple high speed communications ports Define the acronym NTCIP - CORRECT ANSWER - National Transportation Communications for Intelligent transportation systems Protocol What is a set of standards established by the consortium for controllers, cabinets and other ITS devices? - CORRECT ANSWER - The NTCIP The National Transportation Communication for ITS protocol was developed to accommodate what two things? - CORRECT ANSWER - Needs of subsystems User Services Traffic signal supports and the signal indications and signs that are attached to them should be periodically reviewed to ensure what? - CORRECT ANSWER - That they are performing the function that they were installed to do. Safety of what two entities is the first concern when performing maintenance on traffic signal supports? - CORRECT ANSWER - Workers The public The traffic field signal technician should review the work to be performed to ensure that all necessary "what" is ready and available? (2) - CORRECT ANSWER - Equipment Inventory Traffic signal support poles that have a span wire assembly attached to them are called what? - CORRECT ANSWER - Strain poles Strain poles are designed to withstand the strain from the loads that are placed on them by what two items? - CORRECT ANSWER - Traffic Signals Support cables The reinforcing on a concrete strain pole is arranged to primarily withstands loads in how many directions? - CORRECT ANSWER - One direction The side of the pole that is to be turned toward the load is called? - CORRECT ANSWER - The load face Overhead signs used in traffic signals are what two types? - CORRECT ANSWER - Regulatory signs Street name signs How are "blank-out" signs illuminated? - CORRECT ANSWER - Internally When are blank-out signs only activated? (2) - CORRECT ANSWER - Specific times of day Specific events Several considerations must be made before actively engaging in work with a lift truck, these include (5): - CORRECT ANSWER - Positioning if the vehicle in or adjacent to the roadway Establishing a temporary traffic control zone Verification of overhead conflicts Planning the work to be performed Using an approved safety harness Bucket trucks may have a boom that is capable of rotating and extending which is called? - CORRECT ANSWER - Articulating boom What are some disadvantages of an aerial platform lift?(4) - CORRECT ANSWER - Only extends vertically Cannot reach as high as boom trucks Must be parked on flat ground Must be positioned directly below work area. The primary purpose of the traffic signal monitor unit is to act as? - CORRECT ANSWER - Guard against system malfunction If a malfunction is present the monitoring unit will automatically put the intersection into what mode? - CORRECT ANSWER - Flashing condition An intersection will remain in flash mode until the monitor unit is? - CORRECT ANSWER - Reset The CMU and MMU checks the controller for what two things? - CORRECT ANSWER - Proper power Timing functions What will cause the monitor (CMU) to transfer the intersection into flash mode?(3) - CORRECT ANSWER - Loss of power to the controller The 24 volt DC voltage of the controller is lost Time it takes to change from one indication to another is incorrect What does each conflict monitor have that is unique for that particular intersection - CORRECT ANSWER - Program card What are short lengths of conductors on the program card called? - CORRECT ANSWER - Jumpers On the program card jumpers are installed to tell the unit "what" are considered compatible?(2) - CORRECT ANSWER - Movements Channels For NEMA type controllers positions not having jumpers are considered as? - CORRECT ANSWER - Conflicts Program cards for type 170 controllers use a "what" as a jumper to wire the positions which are considered conflicts? - CORRECT ANSWER - Diode Why is it important to periodically review the monitor cards? - CORRECT ANSWER - To be sure the jumpers are assigned correctly What is used to provide the required flash rate when the signal is in flashing operation? - CORRECT ANSWER - Flasher unit The MUTCD requires that when a signal is flashed that the light source be flashed at a rate of? - CORRECT ANSWER - Not less than 50 or more than 60 times per minute What relays are a type of relay that is capable of switching high levels of current? - CORRECT ANSWER - Mercury Contactor In a traffic signal cabinet the mercury contactor controls the 120 VAC to all of the? - CORRECT ANSWER - Load switches These devices are being replaced by many agencies due to what type of concerns? - CORRECT ANSWER - Environmental What are used in traffic signal controller cabinets that are solid-state devices that monitor a mechanical switch or button and report the call status back to the controller unit? - CORRECT ANSWER - Isolators What are the two basic types of isolator or isolator cards? - CORRECT ANSWER - AC isolators DC isolators What are the most common isolator cards? - CORRECT ANSWER - Loop detector cards What are two other special purpose cards? - CORRECT ANSWER - Video detector cards Emergency vehicle pre-emption Load switches in the controller cabinet receive 24V DC and switch (reroute) the 120V AC to the lamps in the signal head. This potentially reduces: (2) - CORRECT ANSWER - The number of faults induced into the controller from outside the cabinet. Electrical surges Why do some agencies operate signals in full operation mode for a period of time, then switch to flashing mode? - CORRECT ANSWER - To preserve the battery life Battery backup system manufactures claim that switching to red flashing operation at "what battery" level percent significantly extends run time? - CORRECT ANSWER - 40% What type of backup power systems require significant manpower and monitoring during use? - CORRECT ANSWER - Portable generator Intersections using LED displays use approximately what % of power that incandescent displays use? - CORRECT ANSWER - 10% What piece of test equipment can be directly connected to many different traffic signal control equipment groups? - CORRECT ANSWER - Laptop computer What are several of the functions a laptop computer can perform in relation to a traffic signal controller?(5) - CORRECT ANSWER - Set up equipment Download operational parameters to the equipment Upload signal system software Upload traffic signal timing plans Set up video detection What are the two typical forms of interconnectivity for testing equipment? - CORRECT ANSWER - Ethernet cable Serial communication cable What type of software program is typically used as a user interface? - CORRECT ANSWER - Windows - based graphical user interface What is also known as volt/ohm meter or VOM - CORRECT ANSWER - multi-meter What is an electronic measuring instrument that combines several functions into one unit? - CORRECT ANSWER - multi-meter A standard multi-meter includes what three main measurement features? - CORRECT ANSWER - Voltage Current Resistance A multi-meter provides the ability to measure?(3) - CORRECT ANSWER - DC and AC voltage DC and AC current Resistance What are the two types of multi-meters? - CORRECT ANSWER - Analog