The term AUTOBAHN UNIT can be broken down into four crossword solutions: AUDI (4 letters), LANE (4 letters), AUDIS (5 letters), and OPEL (4 letters). AUDI is a German automobile manufacturer, founded in 1909 by August Horch. LANE is a section of a road that is marked off by lines or barriers and is designed for a single line of traffic. AUDIS is the plural form of AUDI, referring to multiple vehicles made by the company. Lastly, OPEL is another German automobile manufacturer, founded in 1863 by Adam Opel.