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I don't have a definitive answer but this may help: Open Street Map is a free but incomplete mapping of UK roads. They currently have roughly 250,000 "ways" where a way represents a section of road as a directed sequence of points. Some roads need more than one "way" to represent their shape e.g. a "T" shape needs 2 ways whereas an "L" shape only needs one.

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17y ago

What else can I help you with?