Every headlamp emitting a main-beam (bright), must be so adjusted and maintained that it shall be capable of adequately illuminating an area ahead of the motor vehicle, enabling the driver/rider to see any person, vehicle or substantial object at a distance of at least 100 metres.
While you may drive with your headlights on high beam in a built-up area, you must dip your headlights when: an oncoming vehicle is within 200m
you are within 200m of the vehicle ahead.
DIPPED BEAM
Every headlamp emitting a dipped-beam must be so adjusted and maintained to be capable of adequately illuminating an area ahead of the motor vehicle, enabling the driver/rider to see any person, vehicle or substantial object at a distance of at least 45 metres ahead of the motor vehicle.
FAQ'S 
VEHICLE LIGHTS... continued
MAIN BEAM (BRIGHT)
Every headlamp emitting a main-beam (bright), must be so adjusted and maintained that it shall be capable of adequately illuminating an area ahead of the motor vehicle, enabling the driver/rider to see any person, vehicle or substantial object at a distance of at least 100 metres. While you may drive with your headlights on high beam in a built-up area, you must dip your headlights when: an oncoming vehicle is within 200m
you are within 200m of the vehicle ahead.
DIPPED BEAM
Every headlamp emitting a dipped-beam must be so adjusted and maintained to be capable of adequately illuminating an area ahead of the motor vehicle, enabling the driver/rider to see any person, vehicle or substantial object at a distance of at least 45 metres ahead of the motor vehicle.