Pipeline for processing PeMS 5-minute station data and Caltrans lane closure records to analyze congestion impacts across LA freeway corridors.

• PeMS detector station data (5-minute interval text exports)
• Caltrans lane closure spreadsheets
• Station metadata with freeway, direction, and postmile ranges

1. Aggregate 5-minute sensor feeds to hourly metrics.
2. Build corridor segments using metadata and postmile ordering.
3. Parse lane closures and expand multi-hour events into hourly slots.
4. Merge closures onto corridors using freeway/direction, postmile overlap, and time overlap.
5. Compare speed, flow, and delay during closure vs baseline hours.

Lane closures with higher lanes-closed percentage tend to correspond with larger speed drops and delay spikes, especially in recurrent PM peak periods.