POMONA — Authorities Wednesday released the name of a 29-year-old Hacienda Heights man killed after his car plowed into the rear of a slowing moving Caltrans struck on the 57 Freeway in Pomona.

Brian Street died at the scene of the crash, which took place just before 2 p.m. on the northbound 57 Freeway, just north of Temple Avenue, Los Angeles County Department of Coroner Lt. Larry Dietz said. His city was not listed at the coroner’s office, however California Highway Patrol officials described Street as a Hacienda Heights resident.

A Caltrans sweeper truck was working on the center median, as two black-and-white CHP cars provided traffic control, CHP Officer Kerri Rivas said. A Caltrans dump truck was in the fast lane, moving at about 5 mph.

Street was driving a 1993 Toyota Corolla north in the fast lane at an unknown speed, the officer said.

“For unknown reasons, the front of the Toyota collided with the right rear of the Caltrans four-yard dump truck,” Rivas said.

The on-scene CHP officers called for backup and performed CPR on the badly injured driver, officials said. Firefighters ultimately pronounced the man dead at the scene.

Any witnesses to the crash were asked to contact the Baldwin Park office of the CHP at 626-338-1164, or after hours, the Los Angeles Communications Center at 323-982-4900.