Portal:U.S. roads/Did you know/February 2011

Disambiguation sign posted in advance of the MD 68 interchange on westbound I-70 near Clear Spring

...that signs (pictured) were placed on westbound Interstate 70 to reduce motorist confusion between Maryland Route 68 and Interstate 68, which meet I-70 17 miles (27 km) apart in Washington County, Maryland?
... that there are about 2,980 miles (4,800 km) of U.S. Routes in the U.S. state of New Mexico, including U.S. Route 491, which was formerly U.S. Route 666?
...that the previous marker for the Massachusetts Turnpike, which had a pilgrim hat with a Native American feather sticking through it, was revised in 1989 to remove the feather as motorists sometimes mistakenly turned in the direction the arrow pointed (right) when attempting to enter the turnpike?
...that residents of Seattle have disparagingly referred to the Tacoma Spur as "the road to nowhere" and likened its exit ramps to tentacles?
...that the section of Interstate 30 in Texas between Fort Worth and Dallas, called the "Tom Landry Freeway", was renamed the Tom Landry Super Bowl Highway between June 15, 2010 and February 6, 2011 to commemorate Super Bowl XLV being held at nearby Cowboys Stadium?