The truck apparently kicked up a rock and it went through the woman's windshield.
The trucker will soon be healthy enough to be transferred to a hospital closer to his family.
Officials say that downtown was basically shut down for the duration of the cleanup.
"I hope a fix is coming," said the CEO of the Nevada Trucking Association.
The hero driver's Marine and firefighting training kicked in.
He has since been taken into police custody.
The woman is expected to make a full recovery.