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Initial public release of HOS Simulator: Truck Hours. Explore U.S. trucking Hours-of-Service rules with a visual timeline, four HOS clocks, driving projections, and what-if planning. Works offline with no account required. Educational simulator only — not a certified ELD or a substitute for official records.
Learn how U.S. trucking Hours-of-Service clocks work — a study simulator
HOS Simulator is a hands-on learning tool for U.S. over-the-road (OTR) truck drivers and students who want to understand how the federal Hours-of-Service (HOS) clocks respond to a driver's day. Build a day, drop duty statuses on a timeline, and watch the clocks react in real time — so the rules finally make sense before you're on the road. IMPORTANT — please read: This app is an EDUCATIONAL SIMULATOR, not a certified electronic logging device. It does not connect to a vehicle, it is not for recording your actual duty status, and it must not be used for roadside inspections or any official record-keeping. It is a study aid only. HOS Simulator is an independent app made by a private developer. It is NOT a government app: it is not affiliated with, endorsed by, or a representation of the Federal Motor Carrier Safety Administration (FMCSA), the U.S. Department of Transportation, or any other government entity, and it does not provide or facilitate any government service. Official government sources: The Hours-of-Service rules this app simulates are published by the FMCSA (U.S. Department of Transportation). Consult the original sources: • FMCSA — Hours of Service: https://www.fmcsa.dot.gov/regulations/hours-of-service • The full regulation, 49 CFR Part 395: https://www.ecfr.gov/current/title-49/part-395 What you can explore: • The 11-hour driving limit • The 14-hour driving window • The 30-minute break • The 60/70-hour cycle limits • The 34-hour restart • Split sleeper-berth periods Features: • A visual day timeline you build yourself — tap to add and adjust duty periods • The four HOS clocks shown as easy-to-read dials • A projection of how much driving time you'd have left • Autofill and "what-if" planning to test scenarios • A continuous, multi-day view of your plan • Home-terminal time-zone handling for day boundaries Private by design: • Works fully offline • No account, no sign-up • Nothing leaves your device — no tracking, no ads, no data collection Available in English, Spanish, Chinese, Punjabi, and Hindi. HOS Simulator helps you build intuition for the clocks. Always follow your carrier's guidance and the current federal regulations for your actual driving — see the official FMCSA sources above.