Automakers will have to focus on women if they hope to make driverless cars mainstream, according to a NerdWallet survey that shows men are far more likely to express interest in the new technology. The survey of more than 1,000 Americans nationwide also exposes a sharp divide in views on self-driving vehicles between millennials and older Americans. Only 37% of women surveyed by NerdWallet expressed any interest in owning a self-driving car, while half of men expressed interest.