* Using Justus Lipsius' definitions.
Here they are from a distance.
Here's a single cross.
Notice the horizontal is attached to the vertical by five bolts.
This is required to create a solid joint.
Close-up of the half-lap joint.
Note the cut-out in the horizontal to accommodate and exploit the full size of the vertical.
Now would the Romans go through all this hassle and bother just to suspend a criminal? I think not.