According to article §54 of the German motor vehicle traffic regulations (STVZO), multitrack vehicles must be provided at the long sides with additional flashing indicators to be mounted in the first third of the front section.

If the permitted total weight is more than 3.5 t, the light intensity of these flashing indicators must lie between 50 cd (min.) and 200 cd (max.). All vehicles with a permitted total weight of less than 3.5 t are to be provided with small lateral flashing indicators (5W). All vehicles with a total weight of more than <nobr>3.5 t</nobr> are to be provided with large lateral flashing indicators (21W).

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Minimum visual angle ranges are pre-defined for mounting of lateral flashing indicators. As a result, it is mandatory to mount various flashing indicators, depending on the attachment width: Small lateral flashing indicators

• Width up to 2,100 mm

Large lateral flashing indicators

• Width between 2,101 and 2,200 mm

Large lateral flashing indicators with adapter

• Width between 2,201 and 2,500 mm

Due to the confinements imposed by vehicle length (cf., item 3.13), permitted total weight and attachment width, the required combinations of flashing indicators/marker lamps are already pre-defined for standard vehicles. Only attachment widths of more than 2,200 mm require large lateral flashing indicators with adapter (can be ordered, PR-No. 8F8).