Section 3(1) of the Principal Act is amended as follows:(a) by omitting "the vehicle onto another vehicle or repositioning the vehicle at a worksite; or" from paragraph (f)(iii) of the definition of motor vehicle and substituting "another vehicle, loading or unloading the vehicle onto another vehicle or manoeuvring at a work site; or" ;(b) by inserting the following definition after the definition of passenger vehicle :police officer has the same meaning as in the Police Regulation Act 1898 ;(c) by inserting the following definition after the definition of semi-trailer :senior police officer means (a) the Commissioner of Police; or(b) the Deputy Commissioner, or an Assistant Commissioner, of Police; or(c) a police officer of or above the rank of inspector;(d) by omitting the definition of speeding offence and substituting the following definition:speeding offence means an offence under the Traffic Act 1925 of a driver exceeding (a) the prescribed speed-limit applying to the driver for the length of road where the driver is driving; or(b) the prescribed speed-limit applying to the driver in particular circumstances;