Model ST probably is one of the most well-recognized and well-known taxi signs on the streets of Stockholm because the model has been in use by Taxi Stockholm for more than 30 years. The roof sign was developed and launched after the deregulation of the Swedish taxi market in 1990 and the idea already then was that the toplight should be a bearer of the company profile and brand. The model combines the shape and design of a traditional taxi sign with a separately illuminated logo zone in the top front side. This separately illuminated "round, yellow mark" is a very well-known hallmark of Taxi Stockholm in the streets of Stockholm. Since 2010 the ST-model also is the official toplight for SVEA taxi alliance.