3. Section 4 of the Principal Act is amended—
(a) by inserting after the definition of “passenger car derivative” in subsection (1) the following definitions:
“ ‘pedestrian' includes a person—
(a) in a perambulator or similar carriage;
(b) in a device designed for use as a toy; or
(c) in a wheelchair;
‘pedestrian crossing' means a portion of a public street—
(a) defined by road markings marked laterally across or partly across the carriageway comprising a series of white stripes alternating with areas of the surface of the carriageway with each stripe lying longitudinally to the public street; and
(b) indicated by a traffic sign inscribed with the word “CROSSING”;
and includes the areas of the surface of the carriageway lying between those white stripes;”;
(b) by adding “or a wheelchair” at the end of the definition of “vehicle” in subsection (1); and
(c) by adding at the end of subsection (1) the following definition:
“ ‘wheelchair' means a carriage—
(a) that is specially designed and constructed for use by a person suffering from a physical defect or disability; and
(b) that, if designed to use a form of power other than human power as the principal means of propulsion, is not capable of travelling, by means of that form of power, at a speed exceeding 7 kilometres per hour.”.