Formula 1's blue flag system broke down at the Hungarian Grand Prix, and the fallout is still going. Around nine laps into the race the automatic system began issuing false signals to cars that were not being lapped; once spotted, it was paused and marshals reverted to manual flags, removing the steering-wheel prompt drivers normally rely on.
Roughly 25 laps later, race leader Oscar Piastri came upon the lapped Williams of Carlos Sainz, who was scrapping with Fernando Alonso. Contact at Turn 2 cost Piastri time he could not afford - Lando Norris jumped him at the next stop - and the Australian eventually retired with a gearbox failure.
Sainz pointed straight at the system. "We didn't have blue lights on the steering [wheel] which normally, when we are in fights like that one where we are fighting for position, it helps us to understand whether we're getting lapped or not," he told The Race. "So at this stage, I had no idea I was about to get lapped."
He was unrepentant when asked whether that should excuse him: "To be honest, I'm really sorry for Oscar but this time I think I have a pretty good excuse for what happened. I don't know if he could also have been a bit more careful given that he's the one fighting for podiums."
Sainz also used the moment to note his own predicament - "if we were not so slow, there wouldn't be so many blue flags. So we know what the solution is."
Piastri was not buying it. Quoted by Motorsport Week's Fleur Rogerson, he said the anger heard on his radio was about the collision, not McLaren's strategy.
"I couldn't believe what happened. Getting crashed into by a lapped car is never one of the things you expect that can go wrong in your race," Piastri said. "I don't really care if he didn't see me. The fact that he didn't and no one told him, or there was a lack of complete awareness, is unacceptable."
His sharpest line concerned where Sainz's focus had been: "He was fighting Fernando for last place like it was the world championship. He's quite critical of others. Others have given him some stick before for being frustrating on track. When you go and do something like that, I think maybe you should look in the mirror a bit."
On the malfunction itself, he told ViaPlay: "For me that's no excuse at all, that's got to be one of the dumbest things I've seen in a race track."
The stewards split the difference, issuing Sainz a five-second penalty rather than ten after judging that limited blue flag visibility had "reduced the degree of culpability". Running 18th, Sainz shrugged: "I took the five seconds. I'm OK with it. I don't care when I'm fighting for P18."
Toto Wolff was angry too, though at different people. With his drivers fighting over third late on, the Mercedes boss told DAZN Espana the situation was "just disgraceful from some of the Teletubbies engineers that sit on the pitwalls of these teams, not telling the drivers what's happening behind."
Haas driver Ollie Bearman also collected five seconds for ignoring blue flags, finishing 19th.
