rWotD Episode 3121: Traffic signal operations specialist Welcome to random Wiki of the Day, your journey through Wikipedia's vast and varied content, one random article at a time.The random article for Wednesday, 19 November 2025, is Traffic signal operations specialist.A traffic signal operations specialist (TSOS) is a certification sponsored by the Transportation Professional Certification Board, Inc., and promulgated by the Institute of Transportation Engineers. Before taking the prerequisite examination, an individual must have at least five years of related working experience, though relevant education or training may be applied toward this requirement. TSOS certification does not substitute for appropriate professional licenses when required for specific responsibilities or jurisdictions.The 100-question certification examination currently includes the following topics:Principles of signals and signal systemsSignal control and functionalityTypes of signalsSupporting hardware devices and subsystemsSignal coordination and progressionSystem typesSpecial user needsDesign standardsTraffic flow theoryElements of signal design and implementationSignal phasing and geometricsPreemption and priorityPavement markings and signingDetectorsSignal head, cabinet and pole placementTemporary traffic control and equipment switch-overInitial turn-on and timing adjustmentsSignal TimingClearance intervalsIsolated signal timingCoordinated signal timingData collection proceduresPerformance measuresSoftware and analysisField implementationSystems controlDocumentationSignal operations and safety reviewsSafety auditScheduled field reviewsReceipt of and response to public inquiriesResponsive field ReviewsReevaluation of phasing and timingSignal removal or modificationAsset management and documentationThis recording reflects the Wikipedia text as of 00:00 UTC on Wednesday, 19 November 2025.For the full current version of the article, see Traffic signal operations specialist on Wikipedia.This podcast uses content from Wikipedia under the Creative Commons Attribution-ShareAlike License.Visit our archives at wikioftheday.com and subscribe to stay updated on new episodes.Follow us on Mastodon at @[email protected] check out Curmudgeon's Corner, a current events podcast.Until next time, I'm generative Matthew.

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