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roads and intermediate roads, called Class-A roads, have numbers from 1 to 129.
**North-south routes have odd numbers; east-west routes have even numbers. The two main exceptions are E4 and E6, both north-south routes.
**The allocation of numbers progresses upwards from west to east and from north to south, with some exceptions.
* Branch, link and connecting roads, called Class-B roads, have three-digit numbers above 130.
* Reference roads

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