Even before entering a destination into a satnav, many will pre-check route and traffic conditions using Google Maps, and whilst conservative with its ETA, en-route traffic information is pretty accurate - how do they do that?.
If you're a security sceptic or have something to hide, then you best look away now, because the reality is, Google track you and others like you – people with location enabled smartphones.
Whether Android or IOS, if you have Location Services enabled within Google Maps, your device is constantly sending data to Google (anonymised they say) and along with hundreds/thousands of other enabled devices, aggregating the data and updating traffic flow in real-time.
Anonymised & aggregated location tracking is to provide valuable public data is a pretty useful service many would agree, but if you’re thinking that’s just too much like Big Brother, then simply disable Location Services within the settings of your smart device.