I
IAS – Internet Application Server
ICC – Interstate Commerce Commission
ICD – Interface Control Document
ID – Identifier or Identification
IDN – Interdepartmental Network (the network that connects all DOT administrators)
IEN – Information Exchange Network
IES – Information Exchange System
IFTA – International Fuel Tax Agreement
INS – Immigration and Naturalization Service
Interstate – The transportation of goods in the United States from a place in one State to a place in a different State (including a place outside the United States); OR between two places in one State through another State or place outside of the United States.
Intrastate – The transportation of goods within one State that never crosses State lines or includes a segment outside of that same State.
IRP – International Registration Plan
IP – Internet Protocol
ISSO – Information Systems Security Officer
ISS – Inspection Selection System
ISTEA – Intermodal Surface Transportation Efficiency Act
ITS – Intelligent Transportation Systems (formerly IVHS)
ITSA – Intelligent Transportation Society of America
IMAP – Internet Message Access Protocol