maintained an advertising campaign featuring the slogan German: garantiert grüneWelle, lit. 'Guaranteed Green Wave', which communicated the notion of speed
limit, mostly 50 km/h (30 mph) in urban areas. This system is known as "grüneWelle" in German, "vague verte" in French, or "groene golf" in Dutch (English:
German "Der Grüne Punkt" is considered the forerunner of the European scheme.[citation needed] It was originally introduced by Der Grüne Punkt - Duales