Beginning January 1, 2010, 2011 and later model year 53-foot trailers must comply with SmartWay regulations in the state of California. The rules apply to dry, refrigerated and curtainside van trailers, and they must be SmartWay-certified or retrofitted with equipment meeting SmartWay technical requirements and specifications for fuel-efficient trailers.

Starting on Jan. 1, no 2011 or subsequent model year 53-ft. or longer dry, refrigerated or curtainside van trailer may be pulled by a heavy-duty tractor on a highway in California unless it is either SmartWay-certified or has been retrofitted with equipment meeting SmartWay technical requirements and specifications for fuel-efficient trailers.

SmartWay requirements for 53′ or longer box-type trailers include:

- Low-rolling resistance tires that provide a 3% fuel economy benefit, relative to mid-range rolling resistance tires.
- Trailer side fairings and trailer front-mounted gap fairings or trailer rear-mounted fairings or boat tails

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