Audio, Telephone, RTI (1999-2000): Glossary: R
| RDS | Radio Data System. System for transferring traffic information on the FM waveband. |
| REV | Reverse. Choice of cassette tape direction. |
| Rheostat | Instrument lighting intensity control. |
| RND | Random. Random track choice or CD/MD disc in changer. |
| RTI | Road and Traffic Information. System for route finding in traffic. The system uses satellites, digitally stored maps. gyros and traffic information broadcasts for route finding. |