Although there was some reprieve for automobiles coming into the nation under a significant North American trade pact, new US tariffs on medium- and heavy-duty truck imports went into force on Saturday.
President Donald Trump's administration initiated a Section 232 investigation into these imports to determine their impact on national security, which led to the implementation of a 25 percent tariff on trucks and a 10 percent charge on buses.
In an attempt to encourage domestic production and penalise nations thought to be exploiting the United States, the president has used these investigations, as permitted by the Trade Expansion Act of 1962, to apply tariffs on a variety of items.

Which industries have been affected?
Autos were subject to a 25 percent charge, while the steel and aluminium industries were also impacted by 50 percent duties.
However, the White House stated in October that the new truck tariffs will not be added to the current taxes on steel, aluminium, copper, automobiles, and lumber.
Trucks will not have to pay separate "reciprocal" duties, with rates differing depending on the trading partner.
In May, the American Trucking Associations—which represent about 37,000 businesses—urged the Trump administration to postpone truck tariffs, citing the potential impact that fewer sales could cause to automakers, dealers, and motor carriers.
According to economists, the United States imports the majority of its trucks from its immediate neighbours, Canada and Mexico.Mexican heavy truck 70% of imports
According to an October United Overseas Bank statement, more over 70% of US imports were big trucks from Mexico, with only 20% coming from Canada.
However, under the new regime, the 25 percent tax will only be applied to vehicles that qualify for favourable USMCA status due to their non-US content.
Until the Commerce Department develops a procedure to target their non-US content, eligible truck parts will also go tariff-free.
However, Mexico has already felt the effects of trade pressure, as evidenced by the nearly 26% decline in heavy vehicle exports to the US from January to August.
Due to the industrial sector's downturn, the Mexican economy decreased 0.3 percent year over year in the third quarter.

Mexico and the Trump administration are still negotiating in hopes of reaching an agreement that would lessen the effects of Trump's massive tariffs.