Another pitfall is that (Google) bicycle directions don't mind using dirt roads, rugged hiking trails and even private property. Sometimes, the directions will even use routes that don't even exist.
Google bicycle directions are good for getting to the grocery store. They are awful for getting across the country.
Pitfall, in some part, is true, but Google is working to improve its bicycle routes. Every route suggestion I have sent has been considered and most often adopted.
"Awful" for getting cross country is strong. Google bicycle maps are in Beta, meaning use them if wish, but we are still working on them, and you can help (see above).