Indeed, some freeway-class roads are downgraded for short stretches where no alternative exists, to allow low-speed traffic; examples in the UK include the Dartford Crossing (the furthest downstream public crossing of the Thames), and the former Cumberland Gap, as well as sections of the A1 not yet designated A1(M), various lengths of the A5, and the entirety of other important and near-motorway-standard links such as the A14, A34, A38, A42, A50, and A55 road, long stretches of which carry 70 mph speed limits.