4 JANUARY 1952, Page 22

Side-lights in Fog

Sut,—Recent careful observation convinces me that Janus gives bad advice to motorists when he bids them, during daylight fog, switch on their side-lights only. Sometimes the lights are visible before the vehicle, more often not. Janus will not run into me, because—at least on the open road where fog makes overtaking such a perilous adventure—I always use dapped headlights. They in no way affect the vision of the user, but advertise his approach to oncoming vehicles effectively and without a trace of dazzle.,—Yours faithfully,

[Janus writes: I was by no means advising motorists to switch on side-lights only. I was combating the views of a writer who said that side-lights in a fog made no difference at all. My experience is that they make all the difference in the world.]