I'm in the same situation as Jughed - I can't get far from anywhere in this area without encountering a hill and Z2 is gone. So I ride my rollers a lot, even in summer. I do put a 2 hour cap on it. Just how it is. There are flat roads, but they of course run in valley bottoms, have heavy traffic and mostly no shoulder. I used to ride them 20 years ago, but this area keeps building up and I don't ride them anymore.