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British and Irish Roads
The study of British and Irish roads - their construction, numbering, history, mapping, past and future official roads proposals and general roads musings.
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Re: SW M25 Relief
by Gav View the latest post
Thu Sep 16, 2021 12:26
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Dual carriageway :
A dual carriageway (or dual-carriageway road) is a road where there is a physical barrier separating the two directions of travel. They first appeared on the British road network in the 1920s and became popular from the 1950s onward. Various acronyms are given to the standard of a dual carriageway, which may range from D1 (one lane each way) to D5M (five lanes each way, plus hard shoulders). Although the majority of motorways are dual carriageway, simply having three lanes and a
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