There are about 1,110 miles of interstates, 8,000 miles of Primary highways, 49,300 miles of Secondary (county) roadways, and 11,700 miles maintained and operated by local agencies.
Federal Lands (parks, forests, etc.) roadways add to the roadway miles.
Planning and Engineering towards zero starts with national standards to provide consistency for all users and with best practices for implementing improvements. Local, regional, and state agencies and entities plan, design, deliver, and operate enhancements for safety.
However, all these stakeholders continue to look for new and innovative ways to make our transportation system safer and more effective for all users.