92—Performance of side marker lights
(1) When on, a side marker light fitted to a vehicle must—
(a) show a light visible 200 metres from the vehicle; and
(b) not use over 7 watts of power.
(2) When on, a side marker light fitted to a vehicle must show—
(a) to the front of the vehicle—a yellow light; and
(b) to the rear of the vehicle—
(i) if the light also operates as a rear light or reflector—a red light; and
(ii) in any other case—a red or yellow light.
(3) However, if a pole-type trailer with 2 or more cross-bars or bolsters has the side marker lights permitted by rule 90(3)—
(a) the side marker lights fitted to the front cross-bar or bolster may comply with subrule (2)(a) only; and
(b) the side marker lights fitted to the back cross-bar or bolster may comply with subrule (2)(b) only.