473. Every person who contravenes the second paragraph of section 373 or the third paragraph of section 375 is guilty of an offence and is liable, in addition to costs, to a fine which must be of $20, plus(1) if the speed exceeds the speed limit by 1 to 30 km/h, $5 for each 5 km/h by which the speed exceeds the speed limit;
(2) if the speed exceeds the speed limit by 31 to 60 km/h, $10 for each 5 km/h by which the speed exceeds the speed limit;
(3) if the speed exceeds the speed limit by 61 km/h or over, $15 for each 5 km/h by which the speed exceeds the speed limit.