40 odd years ago when I was a keen cyclist, I accidentally ended up on the A38(M) motorway, (prohibited to cyclists for the benefit of non UK readers), as I was slip-streaming a coach.
Head down over the handlebars and legs pumping hard, I was bowling along at about 30mph, when I missed the turn-off for non-motorway traffic, and found myself in the outside lane.
Luckily it was a quiet time of day and nothing serious happened.
I suppose Jimbuna would have thought "now, there's an arresting sight"