MAP-21 is a bipartisan transportation bill that authorizes funding for federal highway programs over 2 years while maintaining current spending levels. It consolidates 87 existing programs into less than 30 programs to give states more flexibility. Key aspects include focusing funds on the most critical roads, improving freight movement, providing incentives for accelerating project delivery, and establishing performance targets for safety, infrastructure condition, and congestion. The bill also increases funding for credit assistance programs to leverage private investment in transportation projects.