Download Festival could be under threat if there is a repeat of this year’s traffic issues, the head of Leicestershire County Council has warned.The festival caused severe congestion on the roads around Donington Park in Leicestershire as fans arrived on June 7 and 8. Some of them said it took them up to seven hours to get on the site.Nick Rushton, the council leader, described the situation as “an absolute disaster” with the worst queues he’d seen in Download’s history.