MILWAUKEE - Ryan Lips-comb lived to tell how it felt to have a truck run over his head. "Really strange," he said.

Lipscomb, 26 of Seattle, had a concussion but otherwise was unhurt. He was shaken up, especially after he saw his mangled helmet.

Lipscomb, a graduate student in medical physics at the University of Wisconsin-Madison, was riding his bike down a path in Madison on Friday afternoon. As he approached an intersection, he said, he noticed the oncoming delivery truck preparing to make a right turn in front of him.

The truck wasn't going to stop, Lipscomb said, so he slammed on his brakes, flipping his bike and landing in the street.

A moment later, the truck rolled over his head.

"I didn't see it coming, but I sure felt it roll over my head," he told the Capital Times newspaper. "It feels really strange to have a truck run over your head."

His black helmet was flattened, tread marks visible on its cracked frame.

Lipscomb was taken to a hospital and released about three hours later.

Police initially declined to call the incident a hit-and-run, saying it was unclear whether the driver knew that someone had been hit. But Sgt. Bernie Gonzalez later updated the accident report to include the designation.

Police spokesman Mike Hanson said yesterday that no arrests had been made because investigators haven't been able to identity the driver.

In a phone interview yesterday, Lipscomb said he has had some lingering headaches and a stiff neck.

"All things considered, that's about as good as it can get," he said.

Despite the close call, he said, he must focus on school because his qualifying exam for the Ph.D program is next week.

"I think it will probably hit me when I'm done with exams," Lipscomb said.

Lipscomb plans to ride again - he just prefers to wait until after exams are over.

"After that, I'll go out and get a new helmet and be back on my bike," he said.