U.S. Bureau of Transportation Statistics
Monthly counts of people and conveyances entering the United States at land border ports of entry, compiled by U.S. Customs and Border Protection and published by the Bureau of Transportation Statistics (Socrata dataset keg4-3bc2, https://data.bts.gov/resource/keg4-3bc2.json). Each row is one (month, port, measure) combination: measures are Buses, Bus Passengers, Pedestrians, Personal Vehicle Passengers, Personal Vehicles, Train Passengers, Trains and Trucks; value is the count. Units: counts of persons or conveyances. Caveats: land ports of entry only (airports and seaports are not covered); figures are revised as CBP finalizes monthly reports, so recent months can change. Coverage: US-Canada and US-Mexico borders, 1996-01 to the present, monthly granularity. Provenance: BTS keyless Socrata API, U.S. public domain - please cite the U.S. Department of Transportation, Bureau of Transportation Statistics. Primary key: (month, port_code, measure). Cadence: refreshed monthly; new months typically appear 4-8 weeks after month-end. Nullability: value is never null in the feed; latitude/longitude are null for a few ports. Sample use: filter border = 'US-Mexico Border' and measure = 'Pedestrians' to track monthly pedestrian crossings.