Any mapping system you use is never 100%, even your car's GPS system is flawed, so to expect ACA to be any different is just nuts. Like I said before I think ACA is very useful but I don't rely on it 100% nor expect it to be correct. Knowing that I think it's wise to have a secondary printed map like Google of the route you want to take, and even then with two maps there will still be errors.

Back when I use to do some credit card tours with some friends and before ACA and Google Maps came along with the cycling routing feature I use to go to my AAA office and get those trip packs! I would tell them where I was going and they would make me those flip maps purposely avoiding hwys that bikes couldn't be on, it worked good enough.

And as one poster said, the lack of information is part of the exploring type of fun you can have while cycling. But you do need to get the up to date addenda right before you leave for a trip from ACA.