Prevention or restriction of traffic in street vested in Board, during pro

. gress of work.—(1) When any work referred to in section 62 1s being executed by the Board in any public street vested in it, or when any other work which may lawfully be done 1s being executed by the Board in any street vested in it, the Board may direct that such street shall, during the progress of such work, be either wholly or partially closed to traffic generally, or to traffic of any specified description.

1. (2) When any such direction has been given, the Board shall, after notifying in local newspapers its intention to do so, set up in a conspicuous position in or near the street an order prohibiting traffic to the extent so directed, and fix such bars, chains or posts across or in the | street as it may think proper for preventing or restricting traffic therein, |