I went to the Grampians in Victoria recently, and drew on the journey. There were six of us in the car, and I managed to get everyone in my drawing on the top, even if it was just a hand or a section of the face.
Changed seat after a rest stop and I got another view.
And another… it was quite liberating knowing that my marks will not be precised, and often beyong my control and my lines will be crooked. I used pen and watercolour pencils mostly with a waterbrush.