Portal:U.S. roads/Did you know/August 2012

SR 55 southbound at I-405 interchange in Costa Mesa

... that the first carpool lanes in Orange County, California were opened on SR 55 (pictured) in 1985?
... that Maryland Route 378 in Ocean City is entirely one-way northbound?
... that roughly 2% of the United States annual coal supply is extracted from the corridor of Utah State Route 10?
... that M-55 boasted signs at the Cadillac, Michigan, city limits proclaiming the city home of Paul McMullen, a 1500-meter runner who competed in the 1996 Summer Olympics?
... that U.S. Route 178 provides access to the highest point in South Carolina, Sassafras Mountain?