(2) Where—
(a) it is necessary to provide access to and into a wheelchair space, and
(b) it is not possible to comply with the requirements of sub-paragraph (1)(b) or (1)(c),
a horizontal handrail or, at intervals of not more than 300mm, a series of handholds shall be provided
across the gap
(f) contrast with the parts of the vehicle adjacent to the handhold.