 In spite of legal challenges in the High Court and the European Court of Justice, the campaign ultimately failed to save the down, but it was a productive failure, which had a wide-ranging impact upon road planning nationally.Croker's campaigning style was vigorous and passionate, but never sentimental and emotive.It was based upon meticulous research and cogent argument, and he drew upon his professional expertise, honed at IBM, in the technological management of transport issues.