Passenger service hasn't chugged between Detroit and Toronto since at least 1971; the last direct train to pass through the route did so in 1967, according to Amtrak.
The cab companies account for traffic increases in major US cities, but most congestion still comes from personal cars and commercial vehicles, the companies' joint study shows.
The District Department of Transportation is launching a four-month pilot program to invite shared motor-scooters to zip through the city, officials announced last week.