Listen to this article Brawn called the W13 upgrade “impressive” and indicated he believed the FIA has no issue with the route that the Brackley team has chosen. However, he cautioned rivals could raise objections that could lead to the FIA taking a closer look and which could ultimately trigger a rule change. The FIA and the F1 organisation that helped to formulate the new rules are both particularly keen to ensure that the main objective of allowing cars to follow is not compromised. “I think there’s no doubt that the Mercedes concept we didn’t anticipate, it’s a very extreme interpretation of the regulations,” Brawn said in an interview with F1 TV. “And I think inevitably, there’s going be a lot of debate about their interpretation. That’s what happens with new regulations. And however hard you try to close off all the options, and believe me, we closed off hundreds of them, as I say …