The direct route to Terminals 1 and 2 is via the A113 highway, taking the “Flughafen Berlin Brandenburg” exit.
If taking the A113, you will be on the A100, the Berlin city highway within 15 minutes, then travelling south on the Berliner Ring (A10) in 10 minutes.
The address for T1-2 is:
Flughafen Berlin Brandenburg
Please also note the on-site guidance system.