The early morning fog in Doha has again reduced visibility in some places down to around 30 metres. Whilst not all drivers appear to be slowing down or even turning on headlights, the common practice appears to be driving with hazard flashers turned on. I must look, but I am not even sure my car has a rear fog light. Either way fog lights are not being used.  I don’t know whether hazard lights are a legal requirement or just personal safety preference, however the practice does make cars in front much more visible, though rear fog lights would be even more effective.