In normal situation the field of vision of drivers is defined for the situation "straight road". By means of video recording of street situations and computer generated street geometries the frequency distribution of location of traffic signs, pavement markings, objects, lighting equipments etc. in the field of observation of a driver is derived.

These recordings were made for a typical range of streets in Germany at 21 overall length of 5500 km. The data have been determined based on a computer evaluation system.

From these results new requirements can be derived for example on behalf of:​

• light distribution of car headlights
• retroreflection of traffic signs, pavement markings
• glare values for headlamps
• light distribution for rearward lighting
• optical guidance of drivers.