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WASHINGTON — The Government Accountability Office said last week that hundreds of thousands of truck drivers with potentially serious medical conditions are being allowed to drive heavy vehicles, citing loopholes and weaknesses in the federal government’s program to certify drivers.

Third-party logistics company and freight broker Hub Group’s second-quarter net income rose to $15 million, or 40 cents a share, from $13.8 million, or 35 cents, a year ago.

Union Pacific Corp. said Thursday its second-quarter profit rose 19%, on higher demand for agricultural transportation.

Vitran Corp. said Wednesday its second-quarter profit fell 16% to $4.6 million, or 34 cents a share, from $5.5 million, or 41 cents, a year earlier.

Truckload carrier Knight Transportation’s second-quarter profit fell to $12.7 million, or 15 cents a share, from $18.2 million, or 21 cents, a year ago.

Canada’s two biggest freight railroads reported downturns in their second-quarter profits, Bloomberg reported.

Heavy equipment and diesel engine maker Caterpillar Inc. said Tuesday its second-quarter profit rose 34%, led by international demand.

Transportation and third-party logistics firm C.H. Robinson Worldwide said its second-quarter profit rose to $90.4 million, or 52 cents a share, from $82.3 million, or 47 cents, a year ago.

The EPA has mandated equipment on our trucks, which adds weight. Why not allow the carriers the chance to recoup the payload?