One of her most memorable achievements as Transport minister was to pass legislation decreeing that all new cars had to be fitted with seat belts. Despite being appointed to the Ministry of Transport, a role which she was originally unenthusiastic about, Castle could not actually drive herself, and was chauffeured to functions. (The Labour politician Hazel Blears recalled driving Castle at one time as a young Labour Party activist in the 1980s.) Despite her lack of a driving licence, she attracted controversy when she told local government leaders to give added emphasis to motor vehicle access in urban areas, as "most pedestrians are walking to or from their cars."