In the country of Four, there are four cities, A, B, C and D. \(B\) is to the East of \(A\), \(C\) is to the South of \(B\), \(D\) is to the West of \(C\), and \(A\) is to the North of \(D\). The Government plans to connect these four cities by road so that one can go from any city to any other and the total road length is minimum. The distances \(AB,\,BC,\,CD,\,DA\) are all \(10\) km. What should be the total length of the road?