Sargeant 2004 Car Park.

Methods	Design: Randomised controlled trial Duration of follow‐up: 3 months
Participants	Country: United Kingdom Urban workplace Intervention group n=145 Control group n=136 Age, gender not reported; however, they are working age adults
Interventions	Personalised travel advice Travel information pack Ongoing travel advice updates Duration of intervention: 3 months
Outcomes	Travel mode: ‐ % of trips alone by car in preceding 5 working days ‐ % of participants who travelled alone by car for all of preceding 5 working days
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	High risk	Sequence generation method not reported
Allocation concealment?	High risk	Assigned to groups alternately 'at random' from an alphabetical list
Blinding? All outcomes	High risk	Blinding not feasible. Could have influenced outcomes.
Incomplete outcome data addressed? All outcomes	High risk	Loss to follow‐up known to have occurred but participant flow not clearly reported
Free of selective reporting?	Unclear risk	Not clear that all pre‐specified outcomes were included
Free of other bias?	Low risk	No other sources of bias identified
Adequate matching of intervention / control groups?	High risk	Apparently substantial baseline differences in travel mode between intervention and control groups despite randomisation. At baseline, the percentage of individuals driving alone for five days a week in the intervention group was 56.6%, and in the control group was 44.1%.