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The idea of Projet Symone is to have individual autonomous transporters at motorway aires to let drivers drive their car on to the low-loader and then relax while being carried to the next rest area to continue their trip.

Developed by a Dijon group, Symone combines the safety, environmental efficiency and free time of rail travel without the disadvantages of city centre stations, lack of car, less luggage and a fixed timetable.

The idea came after the four friends returned to Dijon from Marseille and faced a six-hour journey with fatigue, stress and a car breakdown.

Vinci Autoroutes has shown in­terest and Projet Symone will develop the idea before working with auto-builders in the run-up to autonomous cars becoming widespread in a decade.