The German "Umweltzone" doesn't make it easy for me to travel in Germany, how do I know if I get a green, yellow or red "Umweltplakette", do I really have to pa and see what I got? Can I do anything with my car to get a higher grade? Is there a "standard value" for an '93 v8, 4,2L ?
How do you guys in Germany do and you other visitors/tourists?

Christer