Fog is set to engulf Somerset as temperatures turn cold once more this evening (December 28).The Met Office has warned that visibility on Somerset's roads could fall as low as 100 metres in places and driving conditions could be icy on untreated roads.The yellow warning it has issued will be in place from 5pm and is set to remain in force until the middle of Thursday, December 29.A spokesman said patches of fog will reform or thicken up quickly during the evening and overnight into Thursday...
