Researchers have recommended that they shut up when a driver is distracted by the road situation around them.
Psychologists have determined that it takes almost half a minute to regain full attention after issuing voice commands in a car.
After a quick check in with the Department for Transport we can confirm your Apple Watch is illegal whilst driving.
Google wants to introduce an 'Android Eyes Free' search interface to help users keep their attention on the road, not their phones.
CES 2014Android in the car has been a major theme of CES this year and ZTE has now upped its existing app.
UPDATEDWith free lifetime traffic information and more friendly guidance features, Garmin's nuvi hopes to be the only driving assistant you'll ever need.
Steering wheels which vibrate to signal when to turn are being tested as an alternative to screen-based sat-navs.
Volvo has been trialling the latest 'road train' tech in Sweden, which effectively allows cars to drive themselves.
Ford has revealed its latest in-car entertainment and control systems, with its new MyFord tech including the option to have Twitter feeds read to drivers.