It's not uncommon to see a squat white droid trundling along the streets of Greenwich, south-east London, as it delivers takeaway food to the borough's residents at 4mph.
In Paris and Helsinki, robot buses are shuttling passengers along city streets, while in Colorado an 18-wheeler truck drove beer 120 miles down a highway - without a driver.
Around the world, projects like these are under way to help develop the technology that will ultimately bring driverless cars and other vehicles to our roads.But alongside the issue of whether they will work is another big question: how will pedestrians, cyclists and human drivers be kept safe?
A world without eye contact
Sales of self-driving vehicles are currently in the thousands, but some estimates suggest that they could reach 10m worldwide by 2030.
But that's just a tiny fraction of the more than one billion cars already on the road.
So, the challenge is figuring out how to accommodate both humans and driverless vehicles on roads, pavements and bike paths.