Guidance summary
Match the airflow to the body and load
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Adjust a roof deflector to guide air over the highest front part of the body, trailer or load. Keep a flatbed load as low as safely possible without overloading an axle. A correctly fitted sheet over a load or empty tipper body can reduce drag. Load restraint and safe access still matter; a loose cover is not a substitute for securing the load.
Source: Match the airflow to the body and load
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