Stuck on the M6?
You need a copy of The M6 Sights Guide.
The book - a follow-up to the M5 Sights Guide - lists more than 400 structures that can be seen from the car or are located near the road.
Among the entries are the so-called "Cloud Factory", near the Knutsford services in south Cheshire.
Clouds of steam - and occasionally flames - can be seen periodically from the road, prompting truckers to inform each other by CB radio when it is in operation.
On closer investigation, Mr Jackson found the factory dried grass for cattle feed.