Grosjean in favour of blue flag rule tweak

The Mexican was penalised in the Hungarian GP for holding up Lewis Hamilton and then came under fire from Daniel Ricciardo in Germany, the Aussie suggesting Gutierrez was worse than others at adhering to blue flags.

For his part, Grosjean suggested that the current blue flag rule wasn't optimal, bringing up an example from his race at Hockenheim.

"When they [the faster drivers] are coming with the new tyres, or just the same tyres and much faster, it's easy. [On Sunday], Vettel behind me, he was about two tenths faster because he was on the old tyre, of course, it would take him 10 laps to close a two-second gap," Grosjean recalled.

In the race, Vettel had arrived within 2s of Grosjean on lap 58 and only got within 1.5s of the Haas by lap 61, after which the Frenchman was ordered to let him past.

"I did a few laps in front and then we had the warning from Charlie [Whiting] and we let him by - and that cost us 2.6 second in a straight line. That was a lot of time lost.

"You're not happy because you're fighting for the points as well, but it's the leaders. I don't know, there's no right or wrong answer."

"It's never going to be ideal"

While Grosjean suggests a blue flag rule based on pace deltas is preferred, he reckons it is unlikely to be considered any time soon.

"Ideally, I would like a blue flag system which is in fuction of the delta speed between the cars - so if they're one second faster per lap at a two-second mark is fine.

"If they're two tenths faster a lap at the two-second mark, it's just... you see them in the mirrors, miles away, they're not catching up, so you're like 'why should I let him by?'.

"But that would require quite tough software. It's never going to be ideal."