MOT Regulations for windows
Road Vehicles (Construction & Use) Regulations 1986 as amended specify the minimum levels of light that must pass through the windscreen and front side windows. The limits are:
Motor Vehicles first used before 1 April 1985:
The windscreen and front side windows must allow at least 70% of light to be transmitted through them.
Motor Vehicles first used on or after 1 April 1985:
The light transmitted through the windscreen must be at least 75%. The front side windows must allow at least 70% of light to be transmitted through them.
If the glass is tinted to a point whereby it lets through less light,then the vehicle does not meet legal requirements.
MOT Regulations for lights
A pair of headlights must both emit light of substantially the same colour and intensity. They must emit a steady colour of either white or yellow. Light must be visible from a reasonable distance and Not effect the beam pattern.
Indicators Every direction indicator must emit amber light. Light must be visible from a reasonable distance.
Brake lights A brake light must emit a steady red light and light must be visible from a reasonable distance.
The reflecting surface must be visible from a reasonable distance.