The content originally appeared on: CNN (CNN)Canadian protesters have impeded access to the busiest international crossing in North America again Tuesday, escalating tensions as frustration over demonstrations against Covid-19 rules continues to roil the nation. After idling trucks and vehicles snarled roadways in major Canadian cities over the weekend, 'Freedom Convoy' drivers hindered travel Monday at the Ambassador Bridge that links Windsor, Ontario, and Detroit. Canadian-bound traffic was still shut down Tuesday morning, Michigan officials tweeted, while US-bound traffic was […]