Rail and Air traffic was completely disrupted in the national capital due to dense fog. Road traffic was also badly hit forcing the bus and car drivers to put on their headlights in the early hours of the day. More than 50 domestic and international flights were badly affected. According to Railways 68 trains have been cancelled and 42 rescheduled due to foggy conditions Our correspondent who visited the airport and railway stations reports that a large number of people were stranded due to cancellation and delay in flights and trains. <br/><br/>AIR correspondent Anjali reports that Visibility dropped to below 50 meters this morning adding to the woes of the travelling public. Passangers starnded at the railway sations and airport were running helter skelter to know the status of their trains and flights. That is why,It is high time that the Railways finds a way out to ensure smooth movement of trains. But the good news is that the density of the fog may reduce by tomorrow. R K Vashisht director met office says the fog is mainly due to high humidity and low wind speed .<br/><br/>Be that as it may.It is a testing time for the security forces with high security alert in view of republic day celebrations and low visibilty.<br/><br/>In Rajasthan, Pilani was the coldest place with recording a minimum temperature of 4.6 degree Celsius early this morning.