A construction sign cuts a man's face after he swerves onto the shoulder.
This happened around 2:45 a.m. Saturday on IH-10 near Wurzbach.
According to police, a man was traveling west bound on the highway, in the fast lane with the driver's side window down, when he veered off the road onto the shoulder and hit a construction sign.
The sign bounced off the retaining wall, like a boomerang, and went through the driver's window, cutting his face.
The driver veered to the right, cutting across all lanes of traffic, and hitting the metal guard rail.
A witness stopped and called for help.
The driver was transported to University Hospital in critical condition.
Officials do not know if alcohol played a part in the accident. but they are still investigating.