Quote:
Originally Posted by DonR
Somewhere I read about mounting a turning vane (what was essentially a cut section of pipe) at the cab roof top & at the edged of the windshield/door junction. This is supposed to turn the air so it runs down the sides of the cab & box trailer, which you don't have, more smoothly.
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European truck often have a vane at the lower corners of the cab (which are mostly cab-over-engines)
In the picture below they're visible on both sides of the top grill, in this Volvo pic, they're most obvious on the right side of the cab.
The sunshade at the top of the windshield performs the same task. While not always visible, they're open at the aft end where they are attached.