Virgin and Lotus bosses are calling for blue flags to be abolished, claiming they penalise small teams too much.
Virgin Racing's CEO Graeme Lowdon reckons blue flags hurt smaller teams too much, as they lose big amounts of time letting the leading drivers through.
"We get a blue flag three seconds before someone approaches us, and at the moment three seconds is almost a lap and you have to let them by within four corners," he said. "So we have situations where our guys are pulling to one side and the car behind cannot catch up.
"It's a massive compromise over the whole of a race. We do this graph of time against distance, and you look at the graph and you immediately see where the blue flags start because up to a point of the race we are there or thereabouts in terms of pace, but then it drops away.