This part of EN 1317 is a supporting standard to EN 1317-5 and should also be read in conjunction with EN 1317-1 and EN 1317-2. This part of EN 1317 completes EN 1317-2 because it specifies performance for transitions@ considered as the linkage between safety barriers of different types. This European Standard specifies the direction of impact and the impact points@ for the assessment of transitions and removable barrier sections. It also defines the rules to be followed in the design of transitions that cannot be CE marking.