David Coulthard insists he has no problem with Scott Speed, despite their clash after the Australian Grand Prix.

Scuderia Toro Rosso driver Speed was fined by race stewards for swearing at his Red Bull rival, and later claimed Coulthard had been "a bit physical".

Rookie Speed, whose team is owned by Red Bull, was angry at losing eighth place, and his first Formula One points, after Australian stewards punished him for overtaking Coulthard under a yellow flag.

But Coulthard, in his 13th season at the top, is taking the incident in his stride. He said: "There's no problem in my relationship with Scott. Honestly, I don't know Scott.

"He's a GP2 driver in his third grand prix. Just because we work for the same company doesn't mean I know intimate details of Scott Speed.

"I now know what his reaction is in a stewards meeting to an absolutely clear-cut scenario."

That point took Coulthard to 500 in his career, a milestone only reached by multiple world champions Michael Schumacher, Alain Prost and Ayrton Senna.

The 35-year-old refuses to let the post-race incident cloud his achievement but admits Speed's behaviour has left him puzzled.

"I don't understand his reaction," he said. "I know the rules.

"I understand in golf you have got to hit the ball to the hole, you can't pick it up and drop it. In Formula One you cannot overtake under a yellow flag.

"The stewards had a video which showed three cars one crashing, one passing it slowly, another one passing at speed and a big yellow flag being waved.

"It's the beginning and end of the story. If something beyond your control takes away your point it's unfair."

Speed has defended his reaction to Coulthard, claiming the Scotsman was "disrespecting" him.

However Speed, who would have become the first American to win a point since 1993, believes the incident is now firmly in the past.

"We have done what we can to work out our issues and the energy in the team is now back to being a positive one."