I assume you commute by auto at present? What about driving partway, parking at a safe place (if there is one; maybe a friend's business has a free spot in their lot?), and riding the rest, so you're doing more like 15 miles each way?

80 miles a day is a lot, and particularly if the weather turns against you for the ride home. If you intend to put that much of your time into riding, I hope you're single

What kind of bike would you ride on if you did start commuting that distance? Probably a road-racing or sport-touring bike with a light system, I imagine?