A lack of observation is a contributing factor in many traffic incidents. We therefore have a set of 'observation rules' that all drivers should abide by. One of these rules is to look far ahead.

In densely populated areas, you should try to see as far ahead as the end of the street.

On country roads, you should try to see at least 400 metres ahead.

In the dark, you should try to see further ahead than just the stretch illuminated by your own headlights.