A couple thoughts on this.
1.) If I caused a thing like that I’d run my a$$ off, too, and I’d still be running. That’s just a cold, hard fact of which I am not proud.
2.) I completely understand one does not hold obstacles before bike riders, but it appears this individual was looking the wrong way, as was the first bicyclist who hit the sign. Both were oblivious to what was about to unfold.
3.) Maybe they should add diesel horns to their bikes.