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Table 1 Descriptive (DIs) and key performance indicators (KPIs) of road freight transport

From: The vehicle approach for freight road transport energy and environmental analysis in Spain

Type1 Indicator name Units Measure of Source2
DIs Fleet number National Index PRFSS
Operations number National Index PRFSS
Vehicle kilometres vkm National Index PRFSS
Running kilometres km National Index PRFSS
Tonnes t National Index PRFSS
Tonne kilometres tkm National Index PRFSS
Load capacity t National Index PRFSS
Fuel consumption l National Index E3
Tonnes oil equivalent toe National Index E4
Tonnes of CO2 equivalent tCO2e National Index E5
KPIs Empty running operations % Energy Intensity PRFSS
Empty running kilometres % Energy Intensity PRFSS
Vehicle loading % Energy Intensity PRFSS
Operation factor km/operation Energy Intensity E
Fuel efficiency l/kmor koe/tkm Energy Intensity E
Emission efficiency gr CO2/tkm Energy Intensity E
Vehicle time utilization % Production PRFSS
Transport content km/t Production E6
Transport distance km Logistical reach E7
Transport efficiency tkm/vkm Organization E8
  1. 1DIs: descriptive indicators, KPIs: performance indicators
  2. 2PRFSS: Directly measured by the Permanent Road Freight Sample Survey, E: estimates
  3. 3Estimated from the running kilometres considering an average consumption of 0.25–0.35 l/km; information is based on McKinnon [26], Leonardi [29] and Mataix [30]
  4. 4Estimated from fuel consumption using the equivalences of 41.87 petajoules (1015 joules) per mtoe (106 toe) and 38.66 megajoules (106 joules) per litre of diesel
  5. 5Estimated from toe using the equivalence of 0.345 mtoe per mtCO2e (106 tCO2e), IEA [31]
  6. 6Estimated using Eq. 3
  7. 7Estimated using Eq. 4
  8. 8Estimated using Eq. 5