The Director of the Department of Public Safety or,
in his absence, disability or inability to act, the Mayor and, in
the event of his absence, disability or inability to act, then the
Chief of Police of the municipality, is hereby authorized to provide
by regulation for the closing of any street or portion thereof to
motor vehicle traffic on any day or days during specified hours on
any day whenever he finds that such closing is necessary for the preservation
of the public safety, health or welfare.