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BETHESDA, Md. — Law enforcement officers, government officials and trucking executives joined together to emphasize the dangers of driving aggressively around large trucks, particularly among younger motorists.

The Federal Motor Carrier Safety Administration should identify commercial truck and bus drivers who are at high risk for obstructive sleep apnea, and require drivers diagnosed with the condition to prove they are being treated, the National Transportation Safety Board recommended last week.

The Port of Long Beach and American Trucking Associations last week reached an out-of-court settlement of ATA’s federal lawsuit challenging portions of the port’s Clean Trucks Plan. The agreement will simplify the registration process for carriers moving containers at the port.

Heavy equipment manufacturer Caterpillar Inc. said Thursday that Douglas Oberhelman will become its chief executive officer in July 2010.

Ryder System said Thursday its third-quarter profit fell to $24 million, or 43 cents a share, from $70.2 million, or $1.24, a year earlier.

Universal Truckload Services said its third-quarter net income plunged 68.6% to $1.7 million, or 11 cents per share, from $5.4 million, 34 cents, a year ago.

Transportation and third-party logistics firm C.H. Robinson Worldwide reported a third-quarter profit of $95.5 million, or 57 cents a share, up slightly from $93.6 million, or 54 cents a share, a year ago.

Truckload carrier Knight Transportation’s third-quarter profit fell to $13.1 million, or 16 cents a share, compared with $16 million, or 19 cents, a year ago.