Toyota promises driverless cars on roads by 2020

Toyota has become the latest car manufacturer to test a driverless vehicle on a public road.

The car, a modified Lexus GS, was tested on Tokyo's Shuto Expressway, where it carried out a range of automated manoeuvres.

These included merging into highways, changing lanes and keeping inter-vehicular distance.

Toyota said it aimed to launch related products "by around 2020", when Tokyo is due to host the Olympic Games.

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