April 1928
11 April
The first racing car with rocket propulsion is tested by Opel on the AVUS race track. The car reaches speeds of 100km/h.
[Overesch/Saal, p. 367]
13 April
The first successful German airplane flight over the Atlantic is made with the single engine Junkers aircraft “Bremen”. It is the first flight over the Atlantic from east to west.
[Büttner, p. 787]
19 April
A uniform system of car license numbers is introduced in Germany.
[Büttner, p. 787]