travel_utils.build_time_matrix_valhalla

travel_utils.build_time_matrix_valhalla(
    origins_gdf,
    destinations_gdf,
    valhalla_config_path,
    output_csv_path,
    costing='auto',
    reshape_to_wide=False,
    metric_of_interest='travel_time_minutes',
)

Build a time/distance matrix between origins and destinations using Valhalla and stream results directly to a CSV to maintain a near-zero memory footprint.