A 72-year-old man died after crashing his 2000 Lincoln Town Car on the H-1 freeway near the Waialae Avenue offramp, police said.

Police said he may have suffered a medical condition since he was seen slumped over the steering wheel.

The man was heading eastbound on the H-1 at about 1:04 p.m. when he drove up an embankment near the offramp, and struck a signpost, police said.

The man continued in the right lane, then sideswiped a wall and a guardrail, went left toward the median and then headed right, hitting a rock wall, police said.

Emergency Medical Services transported the man in critical condition to the Queen’s Medical Center, where he died, police said.