I'm not considering big rig trucks as inherently more "valid" participants of traffic than passenger cars. I just consider any road where two types of vehicles

I'm not considering big rig trucks as inherently more "valid" participants of traffic than passenger cars. I just consider any road where two types of vehicles of very different sizes which behave very differently to be an inherently unsafe and inefficient road for all participants. Obviously, the occupants of the larger vehicles are much safer in collisions with the smaller vehicles, but that's not my primary consideration...