I'm not going to address whether you should ride a bike since you can't drive a car safely, you need to figure that out yourself... As to riding a bike 70 miles every day... That's easy, I wouldn't. Can it be done? Yes it can, by a very dedicated person who's goal is riding 70 miles a day, not I suspect by someone who needs to because of your reasons... JMO One thing I would do, is ride a bike to a bus stop up to 10 miles and ride the bus as close as you can get to work and ride the bike the rest of the way up to 10 miles, 40 or less miles a day is much more doable in my book...