Proper fog lights are dipped, they are supposed to have a horizontal cut off like a dipped beam.. but inconsiderate types change the lamps and stop them working correctly..
Sorry but they are NOT dipped. Fact - it's why they should only be used in reduced visibility.
If you want proof just turn yours on and stand on the side of the road- you will be dazzled as they are designed to spread the light outwards towards the kerb.
If they were dipped they wouldn't dazzle anyone- note the last sentence.
Text pinched from a website -
Front fog lamps
Front fog lamps illuminate the road ahead in foggy conditions, both at night and during the day. They give off a short, wide beam of light that is designed to shine through the fog, lighting up the area directly in front of the vehicle and helping the driver see the sides of the road better.
Fitting requirements
You may have up to two front fog lamps fitted to your vehicle. If your vehicle already has two front fog lamps fitted as original equipment, you cannot fit a second pair. Fog lamps should be wired so that they can be turned on or off independently of the headlamps.
Front fog lamps must be white or amber in colour. When purchasing front fog lamps, it is your responsibility to ensure they meet approved standards and are designed for that specific purpose. If in doubt, consult a vehicle lighting retailer.
On the road
Fog lamps should only be used when visibility is severely reduced, eg by snow or fog. It is against the law to use fog lamps in clear conditions (day or night) as they can dazzle other road users.