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Distance and drive time come from OSRM road routing; cost and emissions use the fixed parameters below.

Cost and emission parameters

Truck operating cost
$1.45 USD / km
Emission factor
0.276 kg CO₂e / t·km
  1. Cost: US$2.336 per mile (2025 average), converted to US$1.45/km. American Transportation Research Institute, An Analysis of the Operational Costs of Trucking: 2026 Update. Covers fuel, wages, maintenance, tolls, insurance and truck payments. It is a US benchmark because no per-km truck cost is published for Taiwan, so treat it as an upper estimate.
  2. Emissions: 7.5–16 t ambient-temperature truck freight service at an 80% load factor, including depot emissions. Ministry of Environment (Taiwan) carbon footprint emission factor database, coefficient declared by the MOTC Institute of Transportation (2017).
Cost is for one truck's round trip (2 × one-way distance). The emission factor is per tonne-kilometre of cargo, so emissions are shown per tonne of fertilizer delivered (one-way distance × factor). Reporting it this way avoids assuming a truck payload. The empty return leg is not counted.

Legend

Supplier (size = registered products)
Farmland node (size = hectares)
< 20 km
20–45 km
> 45 km
Supplier names are English renderings of the registered Chinese names. Established English trade names are used where they exist, and the rest are translated (business type) and romanized in Hanyu Pinyin (trade name).