Employees of Expedia's Bellevue headquarters can get cash for not driving alone. It's part of a new program the online travel company is rolling out to reduce single-driver trips. The "Commute Champions Award" rewards employees who drive with others. They'll be entered to win one of five travel awards valued at $1,500, $1,000 or $500, the company said on Wednesday. This is among several new commute programs geared towards reducing single-person trips and enhancing multimodal transportation in preparation…