One of the reasons that they are allowed discretion in urgent cases is the standard that they are trained to. Although some do subsequently fall short and then make headlines, most do drive to a very high standard, and are therefore unnoticed. There are beginner, intermediate and advanced courses. The advanced course alone is 8 hours a day instruction for six weeks. Work that out and compare with what it takes to pass the ordinary test. There are separate tests for town, motorway and country. Points are lost for example, for failing to look over the shoulder when pulling out and for being one mile per hour over the limit.