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Women now comprise more than half the working population and are visible in management and professional careers, and yet they still represent less than 4% of Fortune 500 CEOs, according to Catalyst, a nonprofit organization concerned with expanding opportunities for women in business.

Celadon Trucking Services Inc.’s practice requiring pre-employment physical exams for drivers is the subject of a new lawsuit, in which the federal government said the exams violate a federal law prohibiting discrimination related to certain disabilities.

Although today’s handheld devices continue to become smaller, tougher and far more capable than their clunky, limited-application predecessors, manufacturers and officials at the freight companies that rely on them said the next technological developments will be influenced by what’s happening in the consumer market.

Most truck makers said they will make important announcements of new products this year at the Mid-America Trucking Show, including Peterbilt Motors Co.’s introduction of a new model.

North American truck makers installed 99,504 Cummins Inc. engines into new 2011 Class 8 trucks, slightly increasing the independent engine maker’s leading market share to 39.1% from 38.5% in 2010, WardsAuto.com reported.

Truck tonnage rose 3.6% in January, extending a string of year-over-year growth into a fourth year and buoying optimism that steady improvement in the consumer and manufacturing sectors will continue to lift the freight industry.

TransForce Inc.’s fourth-quarter net income rose to C$41.7 million, or 41 cents a share, from C$34.8 million, or 36 cents, a year earlier, the Montreal-based trucking and logistics company said Wednesday.

Truck and automobile parts maker Visteon Corp. reported a fourth-quarter loss of $26 million, or 51 cents a share, compared with a profit a year ago.