Section 53 of the Principal Act is hereby amended by -
(a) the deletion from subsection (1) of "at a speed or", the insertion after "manner" in that subsection of "(including speed)", and the insertion after "including" in that subsection of "the condition of the vehicle,",
(b) the insertion before "built-up" in subsection (3) of "general,", and
(c) the deletion from subsection (6) of "and that the contravention has caused death or serious bodily harm to another person" and "first-mentioned".