Erstwhile IndyCar points leader Colton Herta called his new Andretti team-mate Marcus Ericsson “dumb” and an “ass” after contact between the pair in the Indianapolis road course race.

Herta led the IndyCar standings for the first time coming into this race, but was up against it from the get go - starting down in 24th because of running out of fuel in qualifying as a consequence of human error in the team.

Then Ericsson appeared to lose the rear end of his car at Turn 3 on lap one and shoved Herta off the road.

“[Expletive] Marcus, [expletive] piece of [expletive]," was Herta’s team radio response as it was broadcast.