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Arkansas Best Corp.’s third-quarter net income fell to $15.4 million, or 61 cents a share, from $18.9 million, or 75 cents, a year ago.

Transportation and third-party logistics firm C.H. Robinson Worldwide said its third-quarter profit rose to $93.6 million, or 54 cents a share, from $83.7 million, or 48 cents, a year ago.

Canadian National Railway, Canada’s largest railroad, said its net income rose 14% to C$552 million in the third quarter, or C$1.16 a share, from C$485 million, or 96 cents, a year ago.

The Federal Motor Carrier Safety Administration soon will introduce a program that will list certified medical examiners on a national registry and require all interstate commercial truck drivers to obtain their medical certification from an approved examiner.

Greatwide Logistics Services, a provider of non-asset-based transportation and third-party logistics services, said it will be acquired by a private investor group.

Forward Air Corp.’s third-quarter profit rose to $12.1 million, or 42 cents a share, from $10.8 million, or 36 cents, a year ago.

Trucks in Pennsylvania will be prohibited from idling their engines for more than five minutes in a 60-minute period under a newly enacted state law.

California environmental regulators said they are beginning to enforce the state’s five-minute idling limit for diesel-fueled commercial vehicles, including those with sleeper cabs.

An index of leading economic indicators improved in September, the New York-based Conference Board said Monday.