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Proposed changes intended to strengthen federal enforcement of fleets that haul hazardous materials would have the unintended effect of damaging the safety ratings of some of the industry’s safest operators.

Truckload carrier P.A.M. Transportation Services said its second-quarter net income rose to $935,000, or 11 cents per share, from $693,000 or 8 cents, a year ago.

Patriot Transportation Holding’s fiscal third-quarter net income rose to $2.68 million, or 28 cents per share, from $2.38 million, or 25 cents, a year ago.

Voters in and around Atlanta will vote Tuesday on a proposition to increase sales tax by a penny to raise $18 billion for transportation projects, the Associated Press reported.

Rand McNally Inc. said it has upgraded the hardware for its TPC 7600 mobile communication fleet-management system.

For carriers, the effort to find the best nonidling cooling option for the truck cab has not been without starts and stops.

Electronic sensors and enforcement are being credited as reducing the number of truck related crashes in Washington State, the Associated Press reported.

The Transportation Intermediaries Association has renewed its bid to force the Pipeline and Hazardous Materials Safety Administration to display more information in its database for consistency with another federal agency.

Satisfaction with model-year 2011 trucks suffered as a result of technology added to comply with 2010 federal emissions regulations, which resulted in customers’ reporting more problems with the trucks, a recent J.D. Power and Associates’ survey found.