For those of us who can't afford a wrist watch, Car makers very kindly include a clock in virtually all cars produced today, Caterham and Westfield excepted.
Clock vary in both position and style, the ultimate in cheap is the back lit digital display, which probably cost about 25p when bought in bulk. Zoom in on the picture below and look carefully at the centre right dial for an example.
The ultimate chronometer award is probably shared by Rolls and Maserati for their meticulously crafted clocks which probably cost Rolex money to make, and keep time just as well as the 25p version.
Things have not always been this way. Clocks were often saved as optional extras for top of the range models and Luxury marques. Fortunately for us normal proles, the Japanese unlike the likes of British Leyland, Ford and Vauxhall, thought that clocks should be available to all people not just the privileged few and since the early/mid seventies clocks have been fitted to all models as standard, giving all the great unwashed access to the time of day. Surely the greatest dissemination and liberation of information before the advent of the Internet.
Other uses include being used as a simple brain powered trip computer when used in conjunction with the trip counter