Identifying official route names from the base map?

Hi there,

I really enjoy using cycle.travel, and now that lockdowns are easing I am daydreaming about planning another route.

When I look at many areas in Europe, I see national and EU-wide bike routes highlighted. Some of them are labeled. For example, in north-eastern France I see "SLL" and "SLR" routes. I'd like to know more about these routes, probably from the official government sources. What's their full name, do they have a theme, can I can find commentaries on them...that sort of thing.

But I don't know what they're called. I've used Google search for things like "SLL bicycle route France" but I am not finding anything. Is there a lookup table or something that lists these routes?

Thank you

Map problem north of about 60 degrees

Hi there -- I'd like to plot a route in Sweden but no matter how much I restart my browser (Firefox) or use a different one (Edge) the interface does not seem to fully load tiles north of about 60 degrees. See screenshot below. Is this expected behaviour?