This road goes rarely on the air. Airplanes are a medium far too easy to discover a new places...too easy, and most of all too expensive for the planet...on flight can go up to 2000 tonnes of CO2...which egal one year of heating a house for instance. Traveling by car is tiring, lonely and also not quite sustainable...unless you decide to share it with strangers who stand up on the road. Hitchhiking might not be as healthy and sutainable as biking or walking...it remains the best way to meet other people, strangers that you would never meet in other situation.