But, of course, as nothing prevents long-distance through traffic from continuing to use the A5, despite its official “bypassing” by the A41, it is generally clogged with lorries, buses, private cars and delivery vehicles. …. Strangely, though, some years back, Kilburn High Road was actually completely closed to traffic for about six months (I may remember this wrongly, but it was for a substantial length of time) for reconstruction of the bridge across the West Coast Main Line. …

Link:
Vole O'Speed: Up and down the A5