I'm in a similar situation. The way we work it out is that on our regular route, I drive out and start where there's less traffic, and dh rides from home. He gets a good workout trying to play 'catch-up' and I'm motivated to be just a bit farther down the road when he does catch me. We usually ride the last 10 miles together. Heck, I can't even draft off him because he rides a recumbent trike!!