Truck blockade at U.S.-Canada border could undermine supply chains for the auto industry.

As Canada’s capital remained paralyzed by nearly two weeks of protests against pandemic measures, a new road blockade effectively cut off Canada’s busiest link to the United States, threatening to undermine a significant sector of the country’s economy.

While smaller than the protests that have buffeted Ottawa’s downtown, the new protest targets the Ambassador Bridge to Detroit. The bridge is a vital link for the automobile industry, which relies on a constant shuttling of parts and components across the border to keep factories humming in Ontario and the Midwestern United States.