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Diesel engine maker Cummins Inc.’s emissions subsidiary will lay off about 100 workers at a Wisconsin plant, effective immediately, because of the slumping North American truck market, the company said.

Class 8 trucks rolled up 139.3 billion miles in 2006, up from 130.5 billion in 2005, according to American Trucking Associations’ American Trucking Trends 2008-2009 report, released this week.

Ryder System will scale back its international business and cut 700 U.S. jobs while temporarily laying off 1,425 workers and focusing its operations on the United States, Canada, Mexico and the United Kingdom.

The U.S. Environmental Protection Agency has issued its final rule requiring heavy-truck manufacturers to install onboard diagnostic systems starting in 2010 to alert drivers when engine emission systems are malfunctioning or deteriorating.

ATLANTA — Meritor WABCO demonstrated its new automatic braking system for heavy-duty trucks that is integrated with its anti-lock braking and stability control systems. Executives said the system can cut accident rates, especially rear-end collisions, which account for nearly 20% of all truck-involved crashes.

There are signs that the rise of global tire imports to the United States is beginning to slow as the economy weakens and costs increase.

The number of U.S. Class 8 trucks on the road at the end of the third quarter dropped by 17,000 from a year earlier, the first year-to-year decline since research firm R.L. Polk & Co. began reporting on truck fleets in 2003.

Less-than-truckload carrier Saia Inc. said it will make lane departure warning systems standard for all new tractors.