Racing sports cars are believed to have triggered a roadside crash on Interstate 595 late Wednesday that killed an 18-year-old

A scene from the incident

A scene from the incident

woman who survived the initial impact but was hit by a passing motorist as she stood on the roadway.

Police are looking for “a green Ford Mustang and a dark-colored sports car.”

Julie Michele Castor, of Davie, died at the scene, Florida Highway Patrol Sgt. Mark Wysocky said.

The deadly collision was triggered about 11:53 p.m. on westbound I-595 just east of University Drive when two sports cars appeared to be “racing in and out of traffic” and one of the cars possibly changed lanes in front of Castor’s 2006 Toyota Corolla, causing her to lose control and crash, witnesses told troopers.

Castor’s Toyota veered into a center concrete barrier and then careened across the westbound lanes and rammed into another concrete wall, Wysocky said.

Castor survived the initial crash but was hit and killed by a passing motorist while she was standing next to her smashed car, Wysocky said.

“It’s a tragic situation to get involved in a crash, survive the crash, and then unfortunately you get hit by a vehicle when you walk back out to the retrieve something from your car,” Wysocky said. “That’s what we think happened. We do know that she was on the side of the road and then went back to her car to get something.”

Castor’s 21-year-old sister, Tiffany Castor, said she was too distraught to speak when reached by telephone Thursday morning.

The driver that hit Castor, Nichole Leeann Custer, 28, also of Davie, remained at the scene, Wysocky said. She was driving a 1997 Toyota Avalon.

The crash caused the closure of the westbound lanes of I-595 for nearly five hours.

The crash remains under investigation and authorities are looking for the drivers of the racing cars — a green Ford Mustang and a dark-colored sports car, Wysocky said.