Korean GP: Jenson Button and Sergio Perez want yellow rules clarified

The McLaren and Sauber drivers were the biggest victims at Yeongam after they slowed for the warning flags being waved for Daniel Ricciardo's stricken Toro Rosso. Neither of them made it through to Q3.

But with some drivers not slowing as much and getting through to the final qualifying shoot-out, there have been suggestions that the FIA should ensure that those that take more care are not penalised.

Button said: "If your sector is not faster, they will not check whether you've lifted, but if you set a green sector they will check if you lifted at the incident and it's a difficult one.

"If you don't lift I don't know what the penalty is. It's something we need to look at because, for example, if you don't lift and you qualify through to Q3 and you put it on pole, you might lose five places with a penalty, but you'll still qualify sixth instead of 11th.

"So it's a tricky one. Obviously the aim is to lift because it's an incident and that is what you should be doing."

When asked if the rules needed looking at, Button said: "It's a very tricky one and I think it has been for many years, and it's something we always talk about.

"But it's very difficult for them to judge or tell us how much to lift. As drivers, we should be lifting for an incident."

Perez, who reckons the few tenths he lost by lifting in Q2 cost him a place in the top 10 on the grid, said: "I think the rule is still difficult.

"Maybe we have to talk about it again in the future because the less you lift the better it is. But still it is a bit difficult to know.

"I went on the safe side and lost a few tenths - 0.25 to 0.3 seconds, so that was it for us."