Many phenomena - wars, plagues, sudden audits - have been advanced as evidence for the hidden hand of Satan in the affairs of Man, but whenever students of demonology get together the M25 London orbital motorway is generally agreed to be among the top contenders for Exhibit A.
Where they go wrong, of course, is assuming that the wretched road is evil simply because of the incredible carnage and frustration it engenders every day.
In fact, very few people on the face of the planet know that the very shape of the M25 forms the sigil odegra in the language of the Black Priesthood of Ancient Mu, and means 'Hail the Great Beast, Devourer of Worlds'. The thousands of motorists who daily fume their way around its serpentine lengths have the same effect as water on a prayer wheel, grinding out an endless fog of low-grade evil to pollute the metaphysical atmosphere for scores of miles around.

From Good Omens, where the M25 appears on the cover.