More glossary terms:
2di: 2-digit Interstate, or an Interstate with a number less than 100 (also includes what are technically one-digit Interstates)
3di: 3-digit Interstate, or an Interstate with a number from 100-999
2du: 2-digit US Route, or a US Route with a number from 1-101
3du: 3-digit US Route, or a US Route with a number from 102-999
BGS: Big green sign, usually used over freeways and tollways
Rural expressway: Divided limited-access highway, having 4 lanes or sometimes more, with grade-separated interchanges at major crossroads and grade crossings at minor crossroads.
Freeway: A limited-access high-speed highway, free of roadway tolls.
Expressway: Can refer to a rural expressway, or can refer to any high-speed limited-access highway with grade-separated interchanges.
Carriageway: a corridor of pavement carrying traffic moving in one certain direction, usually separate from another such corridor moving in the opposite direction. One stretch of divided highway will consist of two carriageways, or sometimes more.
DDI:
Diverging Diamond InterchangeSPUI:
Single-Point Urban InterchangeFHWA: Can refer to the Federal Highway Administration or their official font, considered the classic font on roadway signage.
Clearview: The new font that some roadway agencies have adopted; other agencies go back and forth on using it on roadway signage.