A Chinese company is currently running three self-driving Peterbilt trucks across Interstate 10 in Arizona, with plans to expand their fleet count significantly by year’s end.

The company, TuSimple, has modified the three trucks with their self-driving technology, which includes sensors that allows them to see up to 650-feet down the road.

TuSimple says they have plans on having 25 self-driving trucks on the road by the end of 2018.

The current self-driving fleet isn’t hauling any goods and is just in a testing phase, however beginning in fall, they will start to ship goods on Interstate 10 between Tucson and Phoenix.

Robert Brown, an executive at TuSimple, says although the trucks are 100% autonomous while traveling on the highway, there’s still someone in the driver’s seat at all times.

Brown also said that the self-driving technology currently only works during the daytime, but the company plans to improve it to function after sundown in the near future.

982983958388255