Cars equipped with devices connected to the Internet can be hacked and controlled remotely through smartphones, according to an experiment conducted by a professor in Hiroshima.

Hiroyuki Inoue, an associate professor at Hiroshima City University's Graduate School of Information Sciences, said he was able to remotely open and close car windows, display an incorrect speedometer reading and freeze a car's accelerator.

Inoue said the effects do not directly apply to cars currently on the market as their computers have no Internet access.