11.   The cars crashed into each other in thick fog.

12.   The pile-up happened in thick fog and caused a seven-mile tailback on the motorway.

13.   The pile-up happened in thick fog.

14.   Thick fog is making driving conditions hazardous.

15.   We can look out into fog as thick as cream and be certain it will burn away.

16.   We got lost in the thick fog.

17.   We traveled in thick fog and through whorls of brown blowing mist, which made the woods ghostly.

18.   The crash happened in thick fog.

19.   Thick patchy fog and irresponsible driving were to blame.