I've only got one tour under my belt but one thing I found out during it was to trust the bike route signs if they are there. The first day I wound up going my way I picked off google maps because it was a little shorter than the way the bike route suggested and wound having to ride 2 miles of loose gravel road. The second morning I got on the road and the bike route sign looked like it was taking me on to the on ramp of the freeway. I road around for at least an hour on both sides of the freeway, checking my phone map, my gps map, trying to figure out how to get the half mile up the freeway to the next road that I needed and couldn't get there. Finally I said F it and went for it. About 50 yards down the freeway on ramp a small slightly overgrown bike path appeared off to the side behind some barriers. From there on out if I saw bike route signs that was different from my planned route I followed the signs and always made it to where I wanted to go.