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We had a heated discussion at work earlier. Is a motorway classed as a dual carrigeway?
cheers
No best answer has yet been selected by TomTom. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Although having many shared characteristics with dual-carriageways (multiple lanes, central reservations with barrier etc.) a motorway is a separate classification of highway because of the differences, such as no traffic lights, no roundabouts, no right turns and grade separated junctions (i.e. access from another level via sliproad) to name but a few.
In certain cases where a section of dual-carriageway conforms to motorway standards or may lead on to a motorway with no way to turn off, then this road is designated with an (M) after its number e.g. A1(M).
Skids - whilst it is true that the maximum speed limits for cars, motorcycles etc. are the same, that is not true of other classes of vehicle. For example the limits for buses, coaches and goods vehicles are different. See here http://www.highwaycode.gov.uk/09.htm#103
Hi Gef
I wasn't limiting Axx(M) designated roads strictly to dual-carriageways only, as disproved by the A6144(M), but my answer was phrased in regard to the original question, vis-�-vis dual-carriageway vs. motorway.
To be honest, the number of lanes seems to be of little consequence with regard to the classification of a motorway since the Welsh section of the M4 is almost exclusively two lanes.
This may be of interest - http://www.cbrd.co.uk/motorway/