LUCKNOW, Sept. 10 -- Commuters in the heart of the city were caught in a traffic mess on Tuesday after members of the Bharatiya Kisan Union (BKU) laid siege to Shakti Bhawan in Hazratganj. Hundreds of farmers from Lucknow and neighbouring districts arrived on tractors and open vehicles, blocking the stretch between Shakti Bhawan and Shriram Tower. The protest led to severe congestion at key points including the Hazratganj crossing, Lalbagh, Ashok Marg and MG Road. Traffic diversions caused further jams in Qaiserbagh, Parivartan Chowk and the high court road, where long queues of vehicles were reported. HTC...