Marquart and Schicketanz demonstrate that mobility environments are best understood while movement is occurring rather than reconstructed retrospectively from static interviews. Their Berlin and Leipzig studies use go-alongs and ride-alongs with commuters and schoolchildren to capture ad hoc perceptions of safety, noise, pollution, vulnerability and route choice. The iconic methodological claim is that in-situ mobility reveals situational behaviour that conventional interview settings easily flatten. Participants encounter the street as a changing field of traffic, bodily exposure, memory and decision, and the researcher gains access to how prior experience is activated by immediate spatial cues. The work also stresses complementarity: mobile interviews become stronger when combined with participatory mapping, smartphone tools and group walks. The theoretical contribution is therefore modest but precise: walking and cycling are not merely transport modes but experiential interfaces through which urban environments become perceptible and evaluable. The paper bridges transport planning, health geography and qualitative mobile methods by translating situated experience into planning knowledge.