I saw these in Taiwanese Taxis all the time.

Having worked around real HUDs, these cheap car units definitely not the real thing (they don't have collimators, for example.) Without a narrow-band dichroic filter/combiner, the windshield-mounted reflector has to be dark in order to transmit the light from the LED display. This means that you have the place the HUD "out of the way" so to speak (i.e. it's not going to be like the new BMW/Corvette units that display the information in your immediate field of view.)

They do, however, put info on the windshield if that's what you want.