The Red Bull and Mercedes drivers are under investigation by the FIA stewards in Mexico City after they were seen causing a traffic jam at the end of the pit lane. Three-time world champion Verstappen was pinged for a similar incident at the Singapore Grand Prix, for which he was reprimanded. The FIA later admitted to F1 teams that the controversial decision to give Verstappen a reprimand was a mistake. It was confirmed that Verstappen should have received a standard three-place grid penalty. The FIA promised they would not use the Singapore decisions as a precedent. Meanwhile, Lewis Hamilton is under investigation for allegedly not…