A: A map.
In all seriousness, GPS navigation technology designed to help the aged drive more safely could significantly reduce the number of accidents involving geriatric drivers. Old people already attempt to compensate for reduced faculties by changing driving patterns, not driving at night and taking the simplest routes rather than the fastest. It only makes sense to deploy technology to help them determine "easier" ways to a destination.
At least that's the idea behind a $20 million project being developed at Newcastle University in the U.K. According to The Sun, the research is being funded by the British government, with the end result being a system that would give easy-to-understand directions without suggesting turns across traffic or travel on freeways.