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Case · Transportation

Transportation:real-data speed backtest

Pick a moment and a road sensor in real benchmark data — every PEMS-BAY sensor in San Jose / South Bay (PeMS District 4), every EXPY-TKY link on the Tokyo expressways, or the 207 METR-LA sensors on Los Angeles County freeways — forecast ahead, then compare with what actually happened.

Interactive demo · backtest

Pick a moment,forecast, then reveal

This is a backtest on real data: choose a dataset, a date, a time and a sensor; the model sees only the real data from the two days before the chosen moment and forecasts what comes next. Then reveal the actual speeds and, for comparison, the same time a week earlier (or the day before when last week has no data). Values are vehicle speeds, not traffic volumes.

This is a backtest on classic academic benchmark datasets (PEMS-BAY, EXPY-TKY, METR-LA), recorded years ago; the live mobility board further down this page shows current data.

Horizon

Drag the slider to choose the forecast start time; the map shows every sensor’s speed at that time as you drag, and the forecast for the selected sensor refreshes when you release.

Notable moments

Wed 3 May 2017, sensor 400665 (I-680 S): speed fell from 66 to 6 mph within the next 60 minutes.

San Jose / South Bay (PeMS District 4)

Roads are drawn from the dataset’s own sensor positions, not from a map; each sensor colours its own stretch, one side per direction. Scroll or use +/− to zoom, drag to pan, click a stretch to forecast that sensor.

Sensor

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Data: Caltrans PeMS, as compiled in the PEMS-BAY benchmark (Li et al., ICLR 2018); 325 sensors, San Jose / South Bay (PeMS District 4), California, USA, January–June 2017, 5-minute speeds in mph. Forecasts are generated by the SequenxAI demo model and are not travel advice.

About this demo: times are local Pacific time (PST before 12 March 2017, PDT after). Each sensor and moment is forecast live by the SequenxAI demo model on first request and cached; if inference is unavailable no forecast is shown. A speed of 0 is treated as a missing reading. SequenxAI Traffic, our transportation model, is still in research preview and is not used here.

Live

Beta · Technical demo

Live forecasts on public mobility data

Beyond the backtest, SequenxAI issues forecasts automatically on live public mobility streams (Hong Kong SAR, China journey times and passenger traffic; Singapore taxis and car parks) and scores them once the actuals arrive. Technical demo, not travel advice.

Technical demo, not advice for any decision; see the Terms of Service.

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Open the full live board

Industry dilemma & traditional limits

Transportation series are driven by holidays, weather, events, and incidents, with sharp regime shifts and localized congestion spillover. Classical statistical models and single thresholds often fail at peaks and anomalies, and rarely hand usable uncertainty to operations desks.

Typical scenarios

  • Short-horizon corridor and critical-segment speed/load as a reference for staffing and signal plans
  • Transit ridership vs capacity matching as a reference for headways and extra runs
  • Hub arrival/departure and trunk capacity swings as a reference for buffers and resource staging

Boundaries & non-claims

  • The demo backtests historical benchmark data (PEMS-BAY 2017, EXPY-TKY 2021, METR-LA 2012); it is not a live traffic feed and makes no claim about current road conditions
  • Values are vehicle speeds measured by road sensors, not traffic volumes or travel times
  • Demo forecasts come from the SequenxAI demo model and say nothing about SequenxAI Traffic; the traffic model is not generally available and is not live in any city-scale traffic system
  • Does not replace the final control of traffic authorities or operators, safety interlocks, or signal/AV commands

Co-creation & evaluation

Evaluate forecastson your own data

Try the backtest demo; evaluation scope and delivery are set by written agreement.