Mike Davis and Coleen Clark joined their oldest daughter this week to do a public service video in honor of their youngest child, Lauren, who died Jan. 1, 2009, after being hit by a car on Hempstead Turnpike in Levittown.

They and friends and family members of other young people killed while crossing two of Nassau County's busiest roads -- Hempstead Turnpike and Sunrise Highway -- participated in the making of a short educational film, "Walk Safe," aimed at middle school and high school students. It is being produced for Nassau County Executive Edward Mangano by film students at LIU Post.

The video focuses on "kids urging kids" to take extra precaution when crossing such streets.

Both Davis and Clark are Nassau County employees, he at the public works department and she as a police officer.

Davis said that as a parent he always worried about his four children crossing Hempstead Turnpike. "Lauren was 18, though," he said. She was a senior at Division High School in Levittown when she was hit at night near the Wantagh Parkway.

Davis said he would advise other youngsters to "go to the crosswalk . . . it's all business when crossing the street -- especially that street."

Davis and Clark's oldest daughter, Kelliann Davis, 30, of Long Beach, a high school dean, said that like her parents and other siblings, Michael and Amanda, she sorely misses Lauren "but the family turned her death into a blessing for three other people who became the recipients of Lauren's donated organs."

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Lauren was one of three Levittown high school students to die while crossing Hempstead Turnpike within four years. One is also from Division High School, and one from Island Trees.

"If this [video] affects a handful of students, or saves a few lives, that would be great," Kelliann Davis said. "But young people should also think about how they drive, too -- not just cross. Driving fast, running lights -- it's not worth it. It's not just the people crossing, it's the drivers, too."