The intense cold wave and fog continued to choke rail, road, and air traffic in northern India on Wednesday. Several parts of North India, including Delhi and the adjoining National Capital Region, were engulfed in dense fog. On Wednesday morning, a total of 21 trains, arriving in Delhi, were delayed, while four were rescheduled and 13 got cancelled due to low visibility. A thick blanket of fog also shrouded Gurugram and Noida.Always drive slowly with lights on.Especially the motorcycle wallahs. Yesterday, the maximum temperature in the capital city settled at 25.5 degrees Celsius, six notches above the season's average.