Bobby Epstein, the chairman of the Circuit of the Americas, has responded to Max Verstappen's criticism of the track, admitting that the dip at the bottom of Turn 1 is "not acceptable".
Ahead of the United States Grand Prix, the four-time Formula 1 world champion used his media session to complain about the track surface, saying the bumps were "unacceptable" and adding that they had become "out of control".
