I don't know about conditions anywhere in the world except the USA. But I've ridden across the USA, on different routes, multiple times.
When bicycle touring in this country, you don't usually (almost never, in my case) do bike touring on roads that carry heavy traffic. You ride on mostly empty roads that have very low traffic counts. Every state compiles Average Annual Daily Traffic (AADT) statistics. There are roads where you might see one or two cars an hour.
When bicycle touring in this country, you don't usually (almost never, in my case) do bike touring on roads that carry heavy traffic. You ride on mostly empty roads that have very low traffic counts. Every state compiles Average Annual Daily Traffic (AADT) statistics. There are roads where you might see one or two cars an hour.
Those are the roads to ride on.