add speed limit (indicated by sign next to railway crossing)

remove invalid building; https://maproulette.org/browse/challenges/27775

remove invalid/duplicate ways; https://maproulette.org/browse/challenges/27775

remove invalid/duplicate ways; https://maproulette.org/browse/challenges/27775

remove invalid building; https://maproulette.org/browse/challenges/27775

remove leisure-tag from individual playground items; https://maproulette.org/browse/challenges/27775

fix unclosed polygon; https://maproulette.org/browse/challenges/27775

remove landuse-tag from way; https://maproulette.org/browse/challenges/27775

fix building outline; https://maproulette.org/browse/challenges/27779

fix invalid landuse; https://maproulette.org/browse/challenges/27775

improve position of highways and bus stops; https://maproulette.org/browse/challenges/27774

improve position of highways and bus stops; https://maproulette.org/browse/challenges/27774

improve position of highways based on aerial photographs; https://maproulette.org/browse/challenges/27774

fix tagging (service to footway); https://maproulette.org/browse/challenges/27780

fix connection of driveway to street; https://maproulette.org/browse/challenges/27780

fix short segment of highway=track in between paths; #MR https://maproulette.org/browse/challenges/27780

change way class, connect highways; https://maproulette.org/browse/challenges/27780

update POIs

update position of landuse, highways according to aerial images; add/correct buildings according to ALKIS

correct street names according to ALKIS