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Sales of new Class 8 trucks fell 19.3% in February, while orders for new vehicles plunged more than 70%, according to companies that track the market.

The number of heavy-duty trucks in use in the United States increased 5.2% to 3.51 million Class 8 commercial vehicles last year, as fleet owners stocked up on new trucks and kept more old vehicles in service, market research firm R.L. Polk & Co. said.

UNIVERSAL CITY, Calif. — The president of the Long Beach Harbor Commission said a licensing system would be “up and running within five years” at his port and the neighboring Port of Los Angeles to ensure all trucks entering the facilities meet strict emission standards.

Swedish truck maker Scania AB has reached agreement to buy a Swedish component plant owned by General Motors Corp., Bloomberg reported Wednesday.

While other carriers were debating whether to buy even one Class 8 truck with a 2007 EPA-certified engine, Mike Hasinec at Penske Truck Leasing Co. was knee-deep in testing 2007 engine performance.

LAS VEGAS — Leading heavy-duty truck components manufacturers said technology exists today to build a safer, environmentally friendly and low-cost heavy-duty “world truck,” but major obstacles are consumer acceptance and the lack of a single global standard for emissions and safety technology.

Components maker ArvinMeritor Inc. said its fiscal first-quarter earnings fell to $7 million or 10 cents a share, from $34 million or 49 cents a year earlier, as it said it faced challenges from the automotive, light-duty and heavy-duty truck segments.

The president of trucking software provider TMW Systems said he does not expect a slowdown in sales this year, even as some trucking companies face a downturn in demand for freight-hauling services.

The maintenance managers of two vehicle leasing companies expect few problems in their shops as the truck-operating industry shifts to the next generation of lower-emission diesel engines.

The U.S. Customs and Border Protection agency said Friday that truck carriers entering the United States at all land border ports of entry in California, Texas and New Mexico will be required to present advance electronic cargo information through the Automated Commercial Environment truck manifest system.