Table 1.

Semi-structured discussion guide

Question type	Purpose	Question	Timing
Opening	To get participants acquainted and feel connected	1. Tell us your name, study and whether or not you have a moped -or a driver license.	5 min
Introduction	To begin discussion of topic	2. What springs to mind when you hear the term “active transportation”?	5 min
Transition	To move towards the key questions	3. A) Which transport mode do you use most often to go to school?	5 min
		→it can also be a combination
		→same transport mode to and from school?
		B) Which transport mode do you use to go to other destinations in your neighborhood (short distance)? Such as sport clubs, shops, friends…
Transition		4. A) What is, according to you, a feasible distance to cycle to destinations?	5 min
		B) From research, it shows that 8 km is feasible. What do you think of that?
Key		5. Who thinks he lives on a feasible walking or cycling distance from school? Which elements determine your choice of transportation?	10 min
		- weather
		- physical environment
		- habit
		- influence of parents, friends, partner…
		- fatigue
		- safety
		- financial status
		- time (faster/slower)
		- health (more active…)
		- ecological aspect
		- other intrinsic or extrinsic motivational factors…
		6. Which elements determine your choice of transportation to other destinations in your neighborhood ? Such as sport clubs, shops, friends…	10 min
Transition		7. Think back at the 3 previous years. Did you always go with the same transport mode to destinations in your neighborhood, or was there a switch in transport mode?	5 min
Key	To obtain insight about areas central to the study	8. Think back at the 3 previous years. Which elements made you maintain transport mode or which elements made you switch transport mode to destinations in your neighborhood?	10 min
		- moped –and/or car driver license
		- physical environment
		- social influence (parents, friends, partner…)
		- financial status
		- safety
		- health reasons
		- other intrinsic or extrinsic motivational factors…
		9. A) According to you, what are the advantages and disadvantages of walking and cycling to destinations?
		B) According to you, what are the advantages and disadvantages of using a moped, a motorcycle or a car to go to destinations?	10 min
Key		10. How would you encourage adolescents of your age to cycle or walk more to destinations in their neighborhood?	15 min
		11. Which channels/media would you use to encourage adolescents of your age to cycle or walk more to destinations in their neighborhood?
Ending	To determine where to place emphasis and to bring closure to the discussion	12. Choose one element that influences your choice of transportation the most.	5 min
Ending		13. Is there anything that we should have talked about but didn’t?	5 min