Semi-trailer aerodynamic device

Several such devices have been recognized by the U.S. Environmental Protection Agency's SmartWay Transport Partnership, making them eligible for funding under the Diesel Emissions Reduction Act.

[6] Sean Graham, president of a major supplier of trailer skirts, estimates that in typical use, drivers see fuel savings of 5% to 6%.

[2] Trailers with skirts fitted have also demonstrated reduced tire spray, and drivers have reported improved stability in crosswinds.

[4] As of 2018, over 60% of new trailers produced in Australia are equipped with skirts, whereas the figure is over 50% for the North American market.

[7] Since the wide adoption of trailer skirts, incidents of them becoming detached and colliding with other vehicles have increased.