xmlns:atom="http://www.w3.org/2005/Atom"
21. The control point shall have push-buttons to:
(a)lower the barriers – the ‘lower’ push-button;
(b)raise the barriers – the ‘raise’ push-button;
(c)release the protecting signals – the ‘crossing-clear’ push-button; and
(d)stop the lowering or raising of the barriers – the ‘stop’ push-button.