What makes a dual carriageway

First of all, what makes a dual carriageway? LANES, more than one I hear you say, you’d be mistaken. The central reservation (barrier, grass pavement, etc) that divides the carriageway (road) in two (dual) is the answer. If a national speed limit sign is in place then it 60mph on a single carriageway (no division of traffic other than white lines) or 70mph on a dual (separation of the two sides of the road by some physical barrier).

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