“…The Heidelberg HCI dataset 1 was the first data set covering challeng-1 http://hci.iwr.uni-heidelberg.de/Benchmarks ing weather scenarios, however, without supplying ground truth. The Ground Truth Stixel Dataset [23] contains a set of rainy highway scenes with sparse ground truth labels for the free space. For driver assistance, the immediate surroundings of the car that limit the free space should be detected at all times but without mistakenly detecting a structure within the free space.…”