Cruise intervals

On paper, this is an awesome training technique. Cruise at LT for 6-8 minutes, rest 2 minutes, repeat. Except in this suburban hell we call the Twin Cities, a 48 mile ride doesn't get you out of suburbia to be able to complete even two intervals without running into a stoplight, stop sign that's not rollable or idiot in an SUV making a left turn right into you! I'd really like to incorporate this into my training, but I just don't see how that's going to happen in reality. Portlanders and Boulderites(?), count your blessings and appreciate your urban growth boundary. Maybe I'll have to load up the bike and head out for grav rides once a week...