This category contains icons originally created for flying junctions (in German: Überwerfungsbauwerk), but can also be used for broad-radius curves and other configurations. All these icons connect at a corner with the line running at a 45° angle.
Note: As the ÜW root was somewhat limiting, these curve icons now use the STR root and all follow the new naming rule-set (with redirects for icons named previously):
If the track comes from the top and moves on to the bottom, no additional suffix is required.
If the track comes from the top and moves to a position on the side, a single suffix to determine the direction is added.
STRr to the right
STR3 to corner 3
STR1 to corner 1
If the track comes from a position on the side and moves to the bottom:
a "+" is added to indicate "coming from";
a single suffix is added to indicate the origin.
STR+3 from corner 3
STR+r from the right
STR+1 from corner 1
If the track comes from a position on the side and moves to another position on the side, we add ...
a single suffix to indicate the "to" direction (this suffix must be the one closest to the bottom);
a "+" to indicate "coming from";
another suffix to indicate the origin.
STRr+4 to the rightfrom corner 4
STRl+4 to the leftfrom corner 4
STR2+r to corner 2from the right
STR2+4 to corner 2from corner 4
STR2+1 to corner 2from corner 1
STR2+l to corner 2from the left
Note that the + is omitted if the track starts and ends at the same "level" (i.e. top or bottom).
For the special case of the line running across from right-to-left or vice-versa, the single suffix "q" is added only if the base icon can be rotated in either direction to produce the transverse version.