This isn't the first autonomous driving-related agreement involving Michigan and Ontario, but it's an important one: it'll explore rules and regulations in addition to usual self-driving data collection.

As you might guess, tests like this will be vital to making autonomy a practical reality. Driverless vehicles need to know how to adapt to changing road rules, such as different signage and units of measurement. While this isn't the greatest challenge, it has to be overcome if you're ever going to embark on cross-border shopping trips without touching your steering wheel.