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IMSA Signal Tech Level 1 Glossary, Exams of Advanced Education

A comprehensive glossary of terms related to traffic signal technology and infrastructure. It covers a wide range of topics, including signal components, control systems, detection methods, communication protocols, and regulatory standards. The glossary definitions are concise and informative, making it a valuable reference for professionals and students in the field of transportation engineering, traffic management, and intelligent transportation systems. Fundamental concepts, industry-specific terminology, and emerging technologies, providing a solid foundation for understanding the complex systems that govern modern traffic signal operations. With its clear explanations and extensive coverage, this glossary can serve as a valuable resource for engineers, technicians, researchers, and policymakers working to improve the efficiency, safety, and sustainability of urban and highway transportation networks.

Typology: Exams

2023/2024

Available from 10/15/2024

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IMSA Signal Tech Level 1 Glossary Solved
Accessible Pedestrian Signal - ANS-Device conveying pedestrian timing in non-visual
format (MUTCD)
Active Grade Crossing Warning System - ANS-Signals informing road users of
approaching trains at crossings (MUTCD)
Active Sensor - ANS-Sensor emitting energy reflected from objects in its zone
Actuated Controller - ANS-Receives data from sensors to adjust signal timing
Actuated Operation - ANS-Signal operation based on detector activation (MUTCD)
Actuation - ANS-Triggering a signal phase change via detectors (MUTCD)
Advanced Transportation Controller (ATC) - ANS-Standardized platform supporting
Intelligent Transportation Systems
Alternating Current (ac) - ANS-Current reversing direction at regular intervals
American Wire Gauge (AWG) - ANS-Standard wire gauge for nonferrous electric wire
Americans with Disabilities Act of 1990 (ADA) - ANS-Ensures equal opportunities for
persons with disabilities
Ampere - ANS-Unit measuring electron flow rate through a conductor
Analog - ANS-Design using continuously varying voltages
Approach - ANS-Traffic lanes moving towards an intersection (MUTCD)
Arterial - ANS-Main street with preferential right-of-way
Auxiliary Equipment - ANS-Additional devices enhancing a controller assembly (NEMA)
Average Day - ANS-Typical day representing normal traffic volumes (MUTCD)
Back Panel - ANS-Board in controller cabinet with terminals and fuses
Background Cycle - ANS-Master controller cycle length outputting system reference
Band (Green Band) - ANS-Elapsed time allowing vehicles through an intersection
Beacon - ANS-Traffic signal operating in a flashing mode (MUTCD)
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IMSA Signal Tech Level 1 Glossary Solved

Accessible Pedestrian Signal - ANS-Device conveying pedestrian timing in non-visual format (MUTCD) Active Grade Crossing Warning System - ANS-Signals informing road users of approaching trains at crossings (MUTCD) Active Sensor - ANS-Sensor emitting energy reflected from objects in its zone Actuated Controller - ANS-Receives data from sensors to adjust signal timing Actuated Operation - ANS-Signal operation based on detector activation (MUTCD) Actuation - ANS-Triggering a signal phase change via detectors (MUTCD) Advanced Transportation Controller (ATC) - ANS-Standardized platform supporting Intelligent Transportation Systems Alternating Current (ac) - ANS-Current reversing direction at regular intervals American Wire Gauge (AWG) - ANS-Standard wire gauge for nonferrous electric wire Americans with Disabilities Act of 1990 (ADA) - ANS-Ensures equal opportunities for persons with disabilities Ampere - ANS-Unit measuring electron flow rate through a conductor Analog - ANS-Design using continuously varying voltages Approach - ANS-Traffic lanes moving towards an intersection (MUTCD) Arterial - ANS-Main street with preferential right-of-way Auxiliary Equipment - ANS-Additional devices enhancing a controller assembly (NEMA) Average Day - ANS-Typical day representing normal traffic volumes (MUTCD) Back Panel - ANS-Board in controller cabinet with terminals and fuses Background Cycle - ANS-Master controller cycle length outputting system reference Band (Green Band) - ANS-Elapsed time allowing vehicles through an intersection Beacon - ANS-Traffic signal operating in a flashing mode (MUTCD)

Cable - ANS-Insulated conductors wrapped together California Department of Transportation (Caltrans) - ANS-Manages California's highways, rail services, and airports Call - ANS-Registration of right-of-way demand at a controller unit (NEMA) Canadian Electrical Code (CEC) - ANS-Standards addressing electrical product safety in Canada (CSA) Changeable Message Sign (CMS) - ANS-Traffic control device for real-time information (ITS) Circuit - ANS-Closed path followed by an electric current Coil - ANS-Conductor wound on a form using electromagnetic induction Conductor - ANS-Medium transmitting electrical current Dual-Arrow Signal Section - ANS-Includes yellow and green arrows for traffic control. Emergency Vehicle Traffic Control Signal - ANS-Assigns right-of-way to authorized emergency vehicles. Equal Employment Opportunity (EEO) - ANS-Prohibits specific job discrimination in certain workplaces. Flasher - ANS-Device turning traffic signals on/off repetitively. Flashing Mode - ANS-Operational mode turning signals on/off repetitively. Frequency-Modulated Continuous Wave (FMCW) - ANS-Radar system modulating continuous wave energy for detection. Fully-Actuated Operation - ANS-All signal phases operate based on actuation. High-Density Polyethylene (HDPE) - ANS-Conduit material in traffic signal installations. Highway Traffic Signal - ANS-Device warning/directing traffic actions on roads. Institute of Transportation Engineers (ITE) - ANS-Association applying tech to transportation research. Intelligent Transportation Systems (ITS) - ANS-Enhances transport safety/mobility with tech.

National Electrical Code (NEC) - ANS-Standard governing electrical installations in buildings. National Electrical Manufacturers Association (NEMA) - ANS-Trade association for electrical manufacturing industry. Non-Locking Memory - ANS-Controller mode dropping vehicle calls after detection area exit. Occupancy - ANS-Percentage of time a sensor's detection zone is occupied. Offset - ANS-Time difference between coordinated phase start and reference signal. Passage Detection - ANS-Ability of a sensor to detect vehicle passage. Pedestrian Change Interval - ANS-Interval displaying UPRAISED HAND signal. Pedestrian Clearance Time - ANS-Time for pedestrian crossing after leaving the curb. Pedestrian Signal Head - ANS-Signal head directing pedestrian traffic at intersections. Permissive Mode - ANS-Allows turns after yielding to pedestrians and traffic Phase - ANS-Traffic signal cycle or specific vehicular movement Phase Sequence - ANS-Predetermined order of cycle phases Platoon - ANS-Group of vehicles traveling together Polyvinyl Chloride (PVC) - ANS-Thermoplastic conduit material for installations Preemption Control - ANS-Special mode for traffic signal operation Presence Detection - ANS-Vehicle sensor detecting moving or stopped vehicles Presence Loop Detector - ANS-Inductive loop detecting vehicle presence Pretimed Operation - ANS-Signal operation without actuation Priority Control - ANS-Modifying right-of-way assignment Protected Mode - ANS-Permits turns with green arrow signal Pushbutton - ANS-Activates pedestrian timing Pushbutton Locator Tone - ANS-Sound indicating need to push button for timing

Queue Length - ANS-Number of vehicles constrained by lead vehicle Ramp Control Signal - ANS-Controls traffic flow onto freeways Recall - ANS-Operational mode displaying phases each cycle Red Clearance Interval - ANS-Optional interval after yellow signal Right-of-Way (Assignment) - ANS-Granting right-of-way to vehicles or pedestrians Ring - ANS-Sequentially timed conflicting phases Roadway Network - ANS-Intersecting roadways arrangement Semi-actuated Operation - ANS-Partial signal phase actuation Separate Left-Turn Signal Face - ANS-Controls left turn with different signal color Shared Left-Turn Signal Face - ANS-Controls left turn with same signal color as through Signal Backplate - ANS-Enhances signal visibility Signal Coordination - ANS-Timed relationships between traffic signals Signal Face - ANS-Controls traffic movements on an approach Signal Head - ANS-Assembly of signal sections Signal Housing - ANS-Protects light source in a signal section Signal Indication - ANS-Illumination of a signal lens Signal Lens - ANS-Redirects light in a signal section Signal Louver - ANS-Restricts visibility of signal indication Signal Phase - ANS-Cycle intervals for traffic movements Signal Section - ANS-Assembly for providing a signal indication Signal System - ANS-Multiple signals operating in coordination Signal Timing - ANS-Allocated time for signal display Signal Visor - ANS-Directs signal indication to traffic