I2V: Infrastructure to Vehicle
IAP: Intelligent Access Program
IBC: International Border Clearance
IBL: Intermittent Bus Lanes
ICC: Interstate Commerce Commission
ICD: Interface Control Documents
ICE: Immigration and Customs Enforcement
ICM: Integrated Corridor Management
ICMS: Integrated Corridor Management Systems
ID: Identifier, Identification
IDTO: Integrated Dynamic Transit Operations
IEC: International Electrotechnical Commission
IEEE: Institute of Electrical and Electronics Engineers, Inc.
IETF: Internet Engineering Task Force
IFTA: International Fuel Tax Agreement
IJIS: Integrated Justice Information Systems
IMA: Intersection Movement Assist
IMMEP: Integrated Multi-Modal Electronic Payment
IMT-A: International Mobile Telecommunications Advanced
INCOSE: International Council on Systems Engineering - membership organization and professional society in the field of systems engineering.
INC-ZONE: Incident Scene Work Zone Alerts for Drivers and Workers
INFLO: Intelligent Network Flow Optimization
INS: Inertial Navigation System
IOOs: Infrastructure Owner/Operators
IP: Internet Protocol
IPS: Intrusion Prevention System
IPsec: Internet Protocol Security
IRP: International Registration Plan
IRW: Infrastructure Restriction Warnings
ISAC: Information Sharing and Analysis Center
ISIG: Intelligent Traffic Signal System
ISM: Intelligent Speed Management
ISMT: Intersection State Memory for Transit
ISO: International Standards Organization
ISP: Information Service Provider
ISTEA: Intermodal Surface Transportation Efficiency Act of 1991
IT: Information Technology
ITE: Institute of Transportation Engineers
ITS: Intelligent Transportation Systems
ITU: International Telecommunication Union
IVIS: In-Vehicle Information System