Remember, if you've just left a well-lit service area, give your eyes time to adjust to the darkness.

Use your headlights Always use your headlights, even on motorways which are lit. Use dipped beam if you're likely to dazzle drivers ahead or oncoming drivers, particularly on a left-hand curve.

If you're dazzled- You have to slow down, but don't brake too hard- there might be a vehicle behind you.

Judging speed
It's harder to judge speed and distance both on a motorway and at night.

If you change lanes to overtake, or to leave the motorway, use your indicators earlier and give yourself even more time.

Reflective studs
These can help determine the road layout. Their positions are as follows.

• Red- between hard shoulder and carriageway.
• White - between lanes.
• Amber- between edge of carriageway and central reservation.
• Green- between carriageway and slip road exits and entrances.
• Fluorescent green/yellow - at contraflow systems and roadwork's