A6144(M) motorway ceased being a special road on 25 May 2006 losing its motorway status. It is now subject to a 50 mph (80 km/h) speed limit and is classified as the A6144. The road through Sale retained the A6144 number, meaning that there are two branches (and two junctions with the M60 motorway) with the same road number. Despite losing motorway status, the road still prohibits pedestrians, cyclists, and horse riders. Following the change of signage on 25 May 2006, two marker posts, the A6144(M) confirmation sign and a lay-by warning sign are privately preserved. A6144(M) motorway The A6144(M) was a
Dartford Crossing then cancelled in 1965, to be replaced by the current transfer service. One of these buses has been preserved. The transport of hazardous goods through the crossing is governed by the European ADR Agreement. The Dartford Crossing is class C, which restricts transporting goods such as nitrates and flammable liquids. The introduction of the ADR scheme initially caused confusion, and for a short time, transporting aerosols through the tunnel was banned. Certain hazardous goods vehicles, together with some oversize and abnormal loads (if permitted) may require escorting by Highways Agency Traffic Officers. The crossing authority must hold exercises in conjunction