than previously thought. These features include the following: many surviving and distinctive toll houses 'depots' along the route, being roadside alcoves to store grit and materials distinctive milestones at each mile – many originals having survived and been restored, others now replaced by replicas distinctive gates in a 'sunburst' design, a few of which have survived a weighbridge at Lon Isaf, between Bangor and Bethesda Tŷ Nant cutting In 1997, a section of bends on Telford's road between Tŷ Nant and Dinmael was by-passed by a modern cutting. However, investigation in 2006 revealed that the rock face in the cutting had become unstable, and the A5 was closed from the end of May 2006. Traffic was diverted onto the old A5 route, on a stretch known as the Glyn Bends, while the rock face was made safe. This involved the removal of 230,000 tonnes of rock and alluvial deposits. In July 2007, the A5 through the reconstructed cutting was reopened. Route London–Milton Keynes Starting at Marble Arch in London, the A5 runs northwest on the Edgware Road through Kilburn and Cricklewood. The A5 number disappears at the A41 near Edgware but the original road continues as the A5183 through Elstree, Radlett, St Albans, Redbourn and Dunstable. A few miles north of Dunstable, the A5 regains its identity at the M1 motorway junction 11A, rejoining the old Roman Road and passing through Hockliffe before becoming a dual carriageway as it approaches Milton Keynes. Milton Keynes–Hinckley On entering the City of Milton Keynes, the road becomes an (almost) fully grade-separated dual carriageway and passes through Milton Keynes. This stretch was opened in 1980, replacing the original route along Watling Street. From just north of MK, after entering Northamptonshire, the road resumes as a single carriageway that continues through Towcester where it crosses the A43 dual carriageway just north of the town. The road accompanies the Grand Union Canal and the M1 motorway through the Watford Gap. It then bridges the M45 motorway and continues to Kilsby. As it passes close to Rugby, the road is diverted slightly around the Daventry International Rail Freight Terminal and then passes the remains of the Rugby Radio Station. The next phase north-west-bound takes it under the M6 motorway and passing close to Lutterworth. Along this stretch, the road frequently alternates between being a single and a dual carriageway. After meeting the M69 motorway at a roundabout,