On 29/09/10 00:12, Ivor The Engine wrote:
In some
places, roads merge then separate but keep their numbering before and
after.

That happens here, too.

The difference is what happens during. In the UK, the common section
has the number of the most major road (only), leading the minor road(s)
to be discontinuous. In the US (and I think in many parts of Europe?)
the common section bears multiple designations.

-roy