SUPT meaning in General ?

A super two, super two-lane highway or wide two-lane, in the United States, is a two-lane surface road built to highway standards. To clarify, this means the road has the wider lanes and other safety features seen on a freeway with more lanes, typically including partial control of access, occasional passing lanes and hard shoulders. It is often built for eventual conversion to freeway or at least divided highway status once traffic volumes rise. It has also been used in cases where environmental concerns are prevalent, such as where Interstate 93 becomes a super two in Franconia Notch, New Hampshire.