The trucks that carry about $300 million worth of auto parts each day over the bridge from Windsor, Ontario, to Detroit are still rolling as usual. But in the aftermath of President Trump’s decision to impose 25 percent tariffs on…

The trucks that carry about $300 million worth of auto parts each day over the bridge from Windsor, Ontario, to Detroit are still rolling as usual. But in the aftermath of President Trump’s decision to impose 25 percent tariffs on…