Wow. Apple CarPlay is software that transfers the functions of a mobile phone to a car's built-in interface. This enables the motorist to operate the handset's sat-nav, music, voicemail, calls and text messages without touching it. So, how does it work? The motorist starts by connecting the phone to a car via USB. But not any old phone – just the iPhone 5s, iPhone 5c or iPhone 5. More handsets will follow in the future. The motorist can then control the handset via three methods (depending on vehicle specification and preference). These include voice commands that operate via Siri Voice Control Software. So, the driver simply presses the voice button – which is typically found on the steering wheel – then says a command. This might be “call x”. The system should then comply – although some people find voice software tricky to master and somewhat unpredictable. There are lots of regional ascents, after all. An alternative is to control the phone via a touch-screen in the centre of the dashboard. This better suits more complicated tasks such as setting the phone's satellite navigation system for a new destination. In contrast, other functions – such as the volume of the stereo or choice of radio station – might be more conveniently controlled by switches on the steering wheel. Wow.