The unveiling of the cars at CES is especially notable because the electronics show comes just a week before the North American International Auto Show in Detroit. That event is one of the largest and most important global automotive shows and is typically where the world's car makers make major announcements.
Several other car makers are also researching self-driving and autonomous automotive technology.
At last year's Ceatec exhibition in Japan, Nissan unveiled a prototype car that could park itself, while Volvo is working on a vehicle platoon system that allows cars to automatically follow one another on long stretches of highway. Alongside Google in Silicon Valley, Stanford University has developed a prototype self-driving car based on an Audi TTS.
Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service. Follow Martyn on Twitter at @martyn_williams. Martyn's e-mail address is firstname.lastname@example.org