It's likely that Hamlin will drop to the back of the field at the start of the race to try avoid an early accident, but he could also risk falling out of the draft.
"He saw the accident and he tried to warn his dad to say avoid Flamingo (Road)" because he knew his father was nearby at the Rio casino, Tehran Boldon said.
Since the accident, the transit authority has stopped using a computer system designed toavoid collisions and is operating the trains manually, leading to delays.
It promises to introduce information campaigns on how young people in particular can avoid accidents, and work with the Royal Society for the Prevention of Accidents to look at new ways of delivering accident-prevention messages.