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Maryland Gov. Martin O’Malley (D) has sent the legislature his proposal for imposing the state’s 6% sales tax on all motor fuel purchases — a plan that based on today’s prices could add nearly $40 in taxes every time a trucker fills up.

Engine maker Cummins Inc. said its 50-50 joint venture with Westport Innovations has introduced a 12-liter version of its natural gas engine.

Logistics firm Expeditors International of Washington said Tuesday its fourth-quarter profit slipped 4%, citing “irregular demand” in the quarter.

There were almost 20 times as many transportation applications available for mobile devices in 2011 as there were the year before, technology experts said.

The Federal Motor Carrier Safety Administration said last week it will conduct research surveys of motor carriers, truckers and technology vendors in an attempt to meet a court requirement that electronic onboard recorders are not used to harass truck drivers.

Federal regulators said they plan to issue proposed rules this year covering stability control systems and speed limiters on heavy trucks, as well as establishing a national drug and alcohol clearinghouse for commercial drivers.

Green Energy Oilfield Services said it will take delivery of 60 Peterbilt 388 liquefied natural gas-powered trucks in April.

Smith Electric Vehicles Corp., a manufacturer of all-electric commercial vehicles, said it has signed a letter of intent with Wanxiang Group, a maker and supplier of automotive parts, to develop electric commercial vehicles for multiple industries in China.

Brenntag North America, a distributor of diesel exhaust fluid, said it opened a bulk rail transfer terminal in Leduc, Alberta, its fourth in Canada.

Sometimes, half a loaf just isn’t enough. And that’s especially true when that half a loaf actually consists of something bad that the other guy didn’t do to you after he had threatened to do so.