[aerohead]

Originally Posted by freebeard

I recall an example of putting round holes instead of horizontal slots in cattle trailers and how it reduces suffocation of the livestock!

It's on EcoModder somewhere. I don't trust Google to find it though.

Speed holes

https://i.kinja-img.com/gawker-media...jzd2eihqoc.jpg

Cattle haulers have Cd 1.15. If you cut holes in a car or truck, that will be your reward.