More and more cities across the world are experimenting with driverless vehicles on public streets. Two of the latest to conduct testing are Paris, France and Las Vegas, Nevada. The cities have used self-driving electric buses to carry passengers on short rides to try out the technology and see how humans react to it. In Paris, two buses have been transporting passengers across a bridge between two of the city’s busiest rail stations. The vehicles, built by French company EasyMile, travel in a special safety lane created for the project. The fully electric buses can carry up to 10 people. The testing in Paris is expected to last three months. If things go well, officials plan to launch more driverless bus lines later this year.