5.11. In the absence of specific instructions, the electrical connection shall be such that the driving-beam headlamp, the passing-beam headlamp and the fog lamp cannot be switched on unless the lamps referred to in paragraph 5.10. above are likewise switched on. This requirement need not, however, be satisfied in the case of the driving-beam headlamp and passing-beam headlamp where their luminous warnings consist in switching on the passing-beam headlamp intermittently, at short intervals, or in switching on the driving-beam headlamp intermittently, or in switching on the passing-beam headlamp and driving-beam headlamp alternately at short intervals. a0c0