A 19-year-old Sterling, Va., man has been charged with reckless driving in connection with a fiery crash that killed four persons at the intersection of Rtes. 28 and 50 in Fairfax County last July 21, Fairfax County Police reported.

Charges were placed Wednesday against David A. Piper, police said.

The victims, 57 year-old Bertha K. Ryan, her daughters, Carolyn, 18, and Shirley, 15, and her cousin, William A. Wright, 47, all of Ashburn in Loundoun County, were in a car that was hit by a dump truck in the intersection, police said. The car had entered the intersection on a green light, according to police.

According to police, the dump truck pushed the car into another truck and the gas tanks of the dump truck and the car exploded. Both truck drivers escaped uninjured.

Previous to the accident motorists had complained that the traffic light at the intersection sometimes malfunctioned and had caused several accidents because of its erratic behavior. Both police and state highway officials said that whenever they investigated, the lights worked propely.

A traffic hearing in Fairfax general district court has been scheduled for Sep. 14, police said. If found guilty, Piper could be lose his driver's license for six months, be fined up to $1,000 and be sentenced to up to a year in jail.