The initial depiction of the junction on the OS One Inch map revision A/* left much to be desired
It was more accurately mapped when the A/*/ revision was rushed out to replace it
Aylesford Interchange (also known as Coldharbour) is junction 5 of the M20.
It was first built in 1960 as the terminus of the A20(M). It was laid out as a Trumpet Interchange, but only the roads to and from the east were initially required. Tight, looped sliproads were common on the MaidstoneBypass, an early example of a motorway. The eastbound onslip served East Park Road and Coldharbour Lane, and was actually called Coldharbour Lane itself. This had been widened to 33 feet.
When the road was extended west, the motorway became the M20, with a crossroads to allow access to Coldharbour Lane.
In the mid-1990s the Maidstone Bypass was widened and re-built, and this junction took its present form of a roundabout interchange.