I left the German names in there to make conversion from right to left easier, and for familiarity - a lot of people are used to the names so can identify assets better than widths.
I'm not sure why you can't find any 3 or 4 way crossings as that's basically all the sceneryobjects is - unless you're after a simple crossing? If this is the case then Crossing (or Junction for 3 way) Altonaer Straße is about 8m wide, and Heerstraße is quite a bit wider.