2.7 Participant travel
If participant travel data are available:
Mode of transport % x average travel distance x mode of transport emission factor
x number of participants x number of visits per participant
Example in which 100 participants travel 100km and 50% go by car and 50% by bus to trial site 3 times:
(50% x 100km x 0.2094 kg CO2 eq per km x 100 x 3)
+ (50% x 100km x 0.1271 kg CO2 eq per km x 100 x 3)
= 5,047.5 kg CO2 eq
If participant travel data are not available:
Mode of transport % x average travel distance x mode of transport emission factor
x number of participants x number of visits per participant
Example in which 100 participants travel 70km and 100% go by car to trial sites 3 times:
100% x 70km x 0.2094 kg CO2 eq per km x 100 x 3 = 4,397.4 kg CO2 eq
Remote visits:
Number of participants x number of remote visits per participant x duration of visit in hours
x laptop electricity x country specific electricity factor
Example in which 100 participants have 5 remote visits that last 1 hour in the UK:
(100 x 5 x 1 x 0.05 kWh x 0.275 kg CO2 eq/kWh) = 6.875 kg CO2 eq
Note: In the first example here, it is assumed that the user has input their own data of 100km distance and 50% car and 50% bus transport. The second example then uses the default values of 100% car travel and 70km for participants. The number of participants in the trial and the number of times they visit the trial site should have been filled out in the ‘countries trial undertaken in’ section. If multiple countries have been entered the participant travel section will be populated with a profile that reflects the countries selected in section 2.2. The default values for each country are uniform, however, the user can edit individual countries so that a country level profile for participant travel can be generated.