My initial aim was to make a map in ArcMap where the traffic volume of Austria's highway is displayed. I couldn't find any data for that. Instead I found data for Vienna. It is a shp-file that consists of points.
When I added the data to a blank map in ArcMap I get a warning, saying that the data I want to import is missing spatial reference (see in the attachment)
https://www.data.gv.at/katalog/dataset/stadt-wien_strassenverkehrszhlung2010wien/resource/4d661e8d-815b-41c7-b6dd-92e0ec1ff2e8
Above you find the link for the data i wanted to import.
How can I make a spatial reference based on the address of the single points?