 Exit numbers on US 15's portions of Jefferson National Pike and the Frederick Freeway were changed to their present numbers in 2002.The interchange between Jefferson National Pike and the Frederick Freeway was transformed from a cloverleaf to a partial cloverleaf interchange in 2004.Access between US 15 and the northern end of MD 355, then named Wormans Mill Road, was removed in 2006, the same year a ramp was added from westbound MD 26 to northbound US 15.