The A5 is one of the original arterial roads serving london. At its extremity, the A5 goes to North Wales. The other end is Marble Arch.
Through much of the journey through London, the road is known as the Edgware Road - often people may refer to the whole of the London section as the Edgware Road. Sections of cross country A5 are Roman - "Watling Street".
The A5 runs north west from Marble Arch as Edgware Road. It intersects the A40 at the Marylebone flyover, and the two Edgware Road Stations. Next, the A5 changes its name to [Maida Vale]?, and passes through an area of the same name.
Entering Cricklewood, the road changes its name to Cricklewood Broadway, then reaches the flyover and roundabout of Staples Corner, where it changes its name, briefly to Edgware Road, then West Hendon Broadway.