A headlamp producing the principal passing beam, that is reciprocally incorporated with another front lamp, must be fitted in such a way that its reference centre lies within the median longitudinal plane of the vehicle.
Teise esilaternaga vastastikku ühendatud lihtlähituld kiirgav esilatern peab olema paigaldatud nii, et selle nullkese paikneb sõiduki keskpikitasapinnal.