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Over and over in their decadeslong war on smog, Southern California regulators have failed to use a powerful tool against ports, warehouses and other freight and logistics hubs that are magnets for air pollution.

Groups representing truckers and other motorists asked a federal judge April 2 to halt the Pennsylvania Turnpike Commission’s payments to PennDOT for state transportation projects while the court decides their claims that turnpike tolls are unconstitutionally excessive.

WASHINGTON — On the campaign trail, President Donald Trump reiterated his pledge to “Make America Great Again” by reinvesting in infrastructure projects around the country. The news was greeted favorably by not only voters, but also municipal governments and the transportation industry.

California began accepting applications April 2 for permits to deploy self-driving cars on public roads without a human backup driver at the wheel.

Stock prices opened the second quarter with another sharp decline April 2 as investors grew increasingly worried about the rising U.S. trade dispute with China and a flurry of problems hammering the nation’s marquee technology firms.

U.S. lawmakers have applied a light touch in regulating robot cars. At the national level, the Trump administration has proclaimed that driverless-car guidelines should be “entirely voluntary” for automakers, and bills pending in Congress would clear the way to putting tens of thousands of autonomous cars on the road — orders of magnitude more than the few hundred in the country today — before federal safety regulations are set.

President Donald Trump charged March 31 that The Washington Post, owned by billionaire Jeff Bezos, should register as a lobbyist, insinuating that it abetted his other company, Amazon, in pulling off a U.S. Postal Service “scam” to deliver its packages at a loss.

UPS Inc. has started operating five cargo flights a week out of San Bernardino International Airport, officials announced March 26.

Enough already. That seemed to be the rallying cry for some truckers who got the chance on March 27 to vent about port congestion directly to the Virginia Port Authority Board of Commissioners.