4. The vehicle shall be examined to ascertain whether its direction indicators comply with the direction indicator requirements and in particular to ascertain whether—
(a)it is equipped with direction indicators which comply with the direction indicator requirements as respects their number, type and the position in which they are attached to the vehicle, and
(b)the said indicators are clean and efficient, and
(c)the colour of each of the said indicators—
(i)if it shows to both front and rear, is amber;
(ii)if it shows only to the front, is amber or white; and,
(iii)if it shows only to the rear, is amber or red, and
(d)each of the said indicators is visible from a reasonable distance, and
(e)where the vehicle is fitted with electric lighting equipment, each of the said indicators shows a steady or flashing light, and
(f)where the said indicators are equipped to show a flashing light, the rate of such flashing is not less than 60 nor more than 120 flashes per minute, and
(g)the vehicle is so equipped that the driver when in his seat is readily aware that a direction indicator is in operation.