Two self-driving cars on Saturday afternoon wrapped up a 2,000-km (1,240 miles) journey in China's first long-distance road test for autonomous vehicles.

The vehicles, produced by Chang'an Automobile, left the southwestern metropolis of Chongqing on Tuesday and arrived at Beijing at about 5 p.m. Saturday.

The cars successfully drove distance from other vehicles, changed lanes, overtook and performed other maneuvers including three-point turns automatically but still need the help of a driver in certain road sections and gas stations, the designers said.

The maximum speed of the cars reached 120 kilometers per hour.

Tan Benhong, deputy director of the Chang'an Automobile Engineering & Research Institute, said they would improve the technologies based on the results of the test and then to prepare for mass production.

Chang'an plans to put driverless cars into commercial use in 2018, Tan said.

Worldwide, at least 18 companies are developing autonomous cars, including BMW, Audi and Toyota. China's contenders include auto makers BAIC group, GAC Group, SAIC Motor, Chang'an and BYD.