来自MSN

US Routes Vs. Interstate: What's The Difference?

There are a number of different road designations in the United States, from highways and freeways to interstates and routes, and it can cause some confusion with different laws and regulations.
Tahoe Daily Tribune

I-80 ranked as 8th most dangerous interstate in US, study says

LAKE TAHOE, Calif. – Part of the Interstate 80 in Northern California ranks in the top 10 most dangerous interstate highways ...