Market indifference -- the mobility gap. You've seen the driver -- too short to see over the wheel, too timid to change lanes safely, maybe taking multiple chronic disease medications -- and still driving. In 15 years, 1 out of 5 drivers will be 65 or older. "The result is a 'mobility gap,' Joseph Coughlin, head of the Massachusetts Institute of Technology's AgeLab, which develops technologies aimed at keeping older people active" said in an interview. Cars can be made smarter, he says, to help save us. But as a society and marketplace, what are the solutions for today's older driver -- let's say just those 4 million above the age of 80? They can call the bus, take the RIDE, ask a friend, but as the current scenario stands -- to stop driving is, as he says, to be on 'house arrest'. Who would want to tell them to stop driving with this patchwork of transportation alternatives, especially in the suburbs where most live?