Speaking just about the UK end of things here ...
Originally Posted by
Gareth B
If it is legal, is it safe to cycle on dual carriageways?
If it's "just" a dual carriageway, and not a motorway then it'll be legal but it might or might not be safe. If it's a dual carriageway within a town/city then you'll probably be okay, if it's a major trunk road linking towns/cities then I'd recommend staying away.
[QUOTE=Gareth B;14711150Does anyone have any experience cycling across European borders? Do we need any special paperwork?[/quote]
You'll need a passport to get into/out of the UK. However assuming you avoid the Kaliningrad exclave then you can get all the way from Latvia to Belgium/France without really noticing where the borders are (you'll need to carry photo id of some kind though).