Roadmaster is a full-size car that was produced between 1935 and 1958 and from 1990 to 1996. Vehicle was a flagship of Buick between 1946 and 1957. There are 8 generations of this model produced in total. Model was discontinued because niche of high-end sedans was already filled in by many car manufacturers and demand for full-size SUV‘s was increased so that‘s why sales of Roadmaster has decreased.