Upper Merion Police say Charles E Haney, 42, of Barton, Maryland was behind the wheel of the van that struck two King of Prussia men.
Haney has not been charged. Police tell Action News criminal charges are pending the results of toxicology testing.
Police say 18-year-old Branden Thornton and 22-year-old Anthony Bonet were walking along the 4000 block of S Gulph Road when they were struck by a van.
It happened at around 11:00 p.m. Sunday.
Bonet refused medical treatment but Thorton was air lifted to The Hospital of the University of Pennsylvania where he remains in critical but stable condition.
Police say Haney left the scene of the accident. They picked him up later at a Motel 6.
Police say Haney has been cooperating fully with the investigation.