The A413 is a major road in England that runs between Denham (west of London) to Towcester (northwest of Milton Keynes).

In Medieval times, the Cartulary of Missenden Abbey simply recorded the road as "the Kings Highway".

The stretch has a high number of blind turnings, sudden speed limits and steep gradients.

The worst accident to occur in recent years was in 2003 when a lorry crashed through the side of a bridge just south of the hamlet of Hardwick.

Aylesbury rockstar John Otway wrote a B-Side about the road on his Number 9 hit single "Bunsen Burner."