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A lot of places in Australia just have a sign at the entrance saying 'Government Vehicles Only'. I don't really think you could make something concise enough to say anything else.
CAR PARK is a sign in general but if I want a [STRIKE]sing[/STRIKE] sign saying that this car park is for government vehicles only, what [STRIKE]do you[/STRIKE] should I say?
As Haniballl said, the shortest way would just be a sign at the entrance saying "Government Vehicles Only". If you want to make it longer (and therefore make the sign bigger), you could put "Car Park for Government Vehicles Only".