map of europe, with many roads highlighted in many colours
https://cdn.masto.host/enosmtown/media_attachments/files/112/123/442/535/989/239/original/df5773cb3712764f.png
Here's the top 1000 longest roads in Europe (connected OSM `highway`'s with the same `name` tag). Shortest is ~53 km long. (lots hidden behind others).
This shows some clear regional differences, which might have more with how data is mapped in #OpenStreetMap, but might also reflect how different cultures *name* roads.
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