From Feeder-Trip Counts to Occupied Feeder Vehicle-Kilometers: Evaluating Directional Feeder Activity and Occupied-Phase CO2 for Low-Carbon Sustainability Assessment at Peripheral Metro Stations

Résumé fourni par la source

Metro feeder activity is commonly summarized by trip counts, although equal counts can correspond to different occupied distances and emissions. Using occupied taxi-trip records from 19 days in June 2023 at six purposively selected peripheral stations on Lanzhou Metro Line 1, this study links directional feeder activity, occupied distance, occupied feeder vehicle-kilometers traveled (VKT), and occupied-phase CO2. Egress dominates in the evening peak and off-peak under the three entrance-buffer specifications, whereas morning balance is buffer-sensitive; Access is more spatially concentrated than Egress. Under the 150 m reference specification, 200,493 feeder trips average 5.451 km and generate 1,092,957 km of occupied VKT. Count-proportional allocation produces station-level VKT errors from −26.7% to +22.3%; five of the six station rankings change under VKT, and top-10 count and attributed-VKT grids overlap by 6.67 of 10. At the same occupied VKT, the all-battery-electric scenario yields 82.10 t of occupied-phase CO2, 37.6% below the proxy-fleet base of 131.57 t; contextual non-occupied-VKT assumptions raise the estimate to 177.80–197.35 t. Counts and occupied VKT capture different operational dimensions. Low-carbon sustainability assessment should combine service frequency, occupied distance, and vehicle technology to support station-area carbon monitoring.

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