Truck side guards

[jwinslow]

Have you seen these on the highway? We just drove by a semi with metal panels between the front and back set of wheels, probably to make crashes safer for cars.

These make a lot of sense and look affordable - one long metal panel on each side - but a quick google search only turns up the outcry to standardize them.

 

[rock454]

They're starting to put these on to restrict wind from getting underneath the trailer and creating drag on the rear wheels. They're supposed to improve fuel mileage on trucks, but I don't know how effective they really are.