The California Air Resources Board (CARB) approved the Tractor-Trailer Greenhouse Gas (TTGHG) Regulation in 2008 to reduce greenhouse gas emissions by improving the aerodynamic performance and reducing the rolling resistance of tractor-trailers. The TTGHG Regulation took effect in 2010. The reduction in greenhouse gas emissions will be achieved by requiring the use of aerodynamic technologies on tractors and trailers, along with requiring the use of low rolling resistance tires. In addition to reducing greenhouse gas emissions, this regulation will reduce fuel consumption, thereby saving fleets money, and reduce our nation's dependence on fossil fuel.
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This regulation applies to owners and drivers of the following equipment when driven on a highway within California.
(1) HD tractors that pull longer than 50-foot box-type trailers; and
(2) Longer than 50-foot box-type trailers that are pulled by HD tractors.