Formula One drivers have become too aggressive because they are walking away from major accidents but "luck will run out one day", Mark Webber has warned.

The Australian says F1's dramatic safety improvements mean drivers are adopting a dangerous feeling of invincibility.

His comments follow the spectacular accident sparked by Lotus driver Romain Grosjean at the recent Belgian Grand Prix at Spa which led to a multi-car pile-up.

Ferrari's Fernando Alonso was lucky to escape serious injury as a car missed his head by centimetres.

It was Grosjean's seventh accident of the season. He and Williams driver Pastor Maldonado have been involved in the most incidents but neither has been injured.

Webber, who has also been involved in death-defying crashes in his career, says drivers know how safe their cars are now so are attacking without thinking of the potential consequences.

"The drivers have to take some responsibility," Webber wrote in his BBC column.

"In the last 10 years, the level of aggressiveness has ramped up a bit just because guys know that usually they'll be able to walk away from a crash.

"But you can be aggressive and safe or aggressive and unsafe. I've always said F1 is not a finishing school when it comes to racing.

"If Grosjean's crash in Belgium had happened in open racing, it would have been fine. But there were lots of cars around, the track is narrow there and very quickly it became a nasty accident."

Webber said overtaking had now become easier with different tyres and driver aids so there was no need for "desperate" starts.

The Red Bull driver says it is likely a sort of forward-mounted roll bar or wheel protection could be introduced in the future for extra head protection.

"Head protection is a controversial subject and, unusually for me, I'm still on the fence on it," Webber said.

"Open-wheel, open-cockpit racing is what most racing drivers want to do - it requires incredible precision and they are the best racing cars in the world.

"The Grosjean incident, and a similar one involving David Coulthard and Alexander Wurz in Australia in 2007, happened because of cars climbing over each other and being launched into the air.

"That also happened to me when I flipped in Valencia in 2010.

"So should you shut off that option somehow by enclosing the wheels but leave the cockpit open? Or leave the wheels open and create more cockpit protection?

"...we have been lucky and we all know that luck will run out one day."