A Prefect's Uncle by P. G. Wodehouse

Gethryn had started on his ride handicapped by two things. He did not know his way after the first two miles, and the hedges at the roadside had just been clipped, leaving the roads covered with small thorns.

It was the former of these circumstances that first made itself apparent. For two miles the road ran straight, but after that it was unexplored country. The Bishop, being in both cricket and football teams, had few opportunities for cycling. He always brought his machine to School, but he very seldom used it.