Dixon was launched into the air on lap 54 after slamming into Howard, who had veered into his path after colliding with the outside wall at Turn 1.
He smashed into a safety barrier, with his Chip Ganassi Racing Honda briefly bursting into flames as it left a trial of debris before finally landing in an unrecognisable heap.
The race was red flagged to clean the track, but both drivers escaped without serious injury. Helio Castroneves was also fortunate after driving underneath the airborne Dixon.
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Dixon said afterwards:
I am fine - just a little beaten up there. I am just bummed for the team. It was definitely a wild ride. We ower a big thanks to the safety standards we have now. It's tough. I was hoping Jay would stay against the wall but I had picked the direction and I was unlucky. You just hold on. You have to believe in the safety we have now.
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