In Romania (at least in Bucharest) we don't have a sytsem like that. The taxi haves just 2 lights except for the one that iluminates the Taxi sign: green and red. Red is when the "clock" is starting to register, otherwise even the taxi is picking up a command (dispacer calling or mobile phone app) there is no way to indiciate that he is picking up a command and that's annoing. But you know, Romania...
Did somebody watched this show?
https://www.youtube.com/watch?v=S23oaLAEUpo
It was brodacasted in Romania around 1996, but I don't think I ever watched an episode (or more then an episode).
Those "Checkers" taxies... I thought they where from the '60's and still in use in the '90's-'000's. In fact they where newer, but had that retro look.
In U.S.A. can you use as a taxi old cars?
Here are some old taxi "clocks":
http://www.fama.hu/index.php?mn=28&o...=en&gkr=Museum
The ones with Ft where used in Hungary. Ft is coming from the Hungrian Forint (national currency of Hungary).
The good thing about changing oil at lower intervals at old cars is that you are sure that you don't get to many residues in it. Or if it is of bad qualty, it won't damage the engine. I don't trust what producers are saying.
It U.S.A. did you ever manufactured automobiles that could use all the fuel from the tank, including wat was on the bottom. Excluding the cars that had fule supply with the help of gravity ("Ford" Model T, "Ford" A... in Europe 'Traban't used this sytem even in 1990 and starting a 'Model A' haves some resemblance with the 'Trabant').