Isn't it called intoxication?

Depends. He didn't mention what his state was when he drove into the tree.
Anyway, a great many alcoholics are actually self-medicated schizophrenics or
manic-depressives.

By the way, speaking of jumping trees, there is a condition called highway
hallucination which can occur in otherwise normal people who are sick or
overtired. I once got this while driving home very late at night while fighting
off an attack of flu. It was terrible. I kept seeing trees, bears, and hills in
the middle of the road. Thank God I didn't hit anything. I slowed to a crawl &
got home about 1 AM, but at least intact.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)