3 month road trip
 

Best roads to ride in Europe in may June July August

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https://www.ride.co.uk/
Here is link to the best rides in 4 countries.
Europe is a big place and whilst 3 months is a decent enough time to ride most of the good roads, I don’t think it will give you much time for a holiday.
Where are you from?
Europe is the second most densely populated continent, so if you’re used to travelling through the USA you can halve your average daily mileage.
Are you coming for a trip or just compiling a list?
If trip and you want more info, please give more details.
bier

Best roads
 

There are excellent roads everywhere.
Just avoid highways and big cities.