According to a spokesperson, the comedian still "has a long way to go" after a Walmart truck driver rear-ended his limo on a New Jersey turnpike earlier this month.
The June 7th crash badly injured the comedian and killed one of his friends
According to the NTSB, the truck driver, Kevin Roper, was going 20 miles an hour over the speed limit.
Investigators also say he may have fallen asleep behind the wheel.
Roper is charged with death by auto and four counts of assault.