PRAIRIEVILLE — State troopers are looking for the driver of a vehicle who hit and seriously injured a 24-year-old man walking across an Interstate 10 overpass in Ascension Parish early Monday, Louisiana State Police reported.

The Geismar man was hit by a passing vehicle sometime between 3 a.m. and 4 a.m. on the La. 74 overpass just east of La. 73, troopers said in a statement. 

Trooper Bryan Lee, spokesman for State Police Troop A, said Monday that because of the victim's injuries, troopers have not been able to talk to him.

Lee said troopers have not found out why the man — whom troopers have not yet named — was walking on the overpass. The La. 74 overpass is a narrow, two-lane highway and the man was walking on it in the dark.

Troopers urge anyone with any information regarding the crash to call State Police Troop A at (225) 754-8500.

Follow David J. Mitchell on Twitter, @NewsieDave.