 Complete the following phrase:  First opened in 1946 in the western suburbs of the city, in the Pedralbes neighbourhood, the course featured wide streets and expansive, sweeping corners; both drivers and racing fans loved the course. The circuit hosted the Penya Rhin Grand Prix four times 1946, 1948, 1950 and 1954.. The circuit also hosted the Spanish Grand Prix in 1951 and 1954 Due to stricter safety rules following the 