LAHORE: Dense fog blanketed different cities of Punjab and Khyber Pakhtunkhwa on intervening night between Sunday and Monday, paralyzing routine life and disrupting road traffic. The thick fog has badly affected the flow of road traffic in several cities of Punjab. According to a Motorway spokesman, several sections of Motorway M-1, M-3 and M-5 have been closed as visibility was very low. The Motorway police have advised the drivers to switch on fog lights while driving at very slow speed as the visibility was dropped to zero meters due to dense fog. The Motorway police have also requested the people to stay in home and avoid unnecessary travelling. This year the country witnesses huge fog, and that is the reason that travelling on motorway is adviced to avoid in the meantime