APPNadvanced radio data information service
arc scanningadvanced radio data information service
ARCnetadvanced radio data information service
radio data service for train approaching announcement
radio data service for train number checking
radio data service for train routing forenotice
radio data service for warning of train protection
ADCCP Advanced data communication control procedure
advanced data communications control protocol
advanced data display system
advanced data link control
advanced data link controller
advanced data management system
Advanced Information System ATIS
advanced information technology
advanced service industry
Advanced traffic information service way