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As the US economy grows, so demand for goods to be transported is surging, which is leading haulage firms to buy more trucks. It is challenging the manufacturers to keep up with demand for new vehicles, but as Kenny Vieth from ACT Research tells the ÃÛÑ¿´«Ã½'s Russell Padmore, the industry also faces a shortage of drivers. (Picture: A Peterbilt truck. AFP/Getty Images.)