Do you know the difference between double lane and dual carriage way?

Double lane simply means a road  that occupies two vehicles at the same times,each following opposite directions but with no physical barriers separating them,examples are the normal local roads

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Can you please explain the difference between the two carriageway

How many meters can it be between the double Lane

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I guess the dual carriage way are the ones we have on express roads

Please can you tell me how many meters can the first and the second lane be away from each other