21. Section 20 of the principal enactment is hereby amended by the repeal of subsection (2) of that section and the substitution therefor of the following subsection:
(2) In this section
| | (i) driver includes the rider of a motor cycle or bicycle and the captain of a ship or air craft; | | |
| | (ii) vehicle includes any carriage, car, motor car, motor cycle, omnibus, tractor, lorry, bicycle or other mechanically propelled vehicle; and | | |
| | (iii) vessel includes an aircraft. | | |
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