MALIBU, Calif. — One motorist was killed in a two-vehicle collision on Pacific Coast Highway in Malibu, authorities said Friday.

The crash occurred shortly after 11 p.m. Thursday in the 22000 block of Pacific Coast Highway west of Carbon Canyon, according to Lt. R. Klumpp of the Malibu/Lost Hills Sheriff’s Station.

The driver was pronounced dead at the scene, Klumpp said.

All lanes of Pacific Coast Highway were closed west of Carbon Canyon for the crash investigation, he said. The road finally reopened at about 8:30 a.m. Friday.

The cause of the crash remained under investigation.

PCH has been the subject of intense scrutiny over safety in recent months, sparked in part by an October crash that killed four Pepperdine students — Niamh Rolston, Peyton Stewart, Asha Weir and Deslyn Williams.

The four students, who were all 20 and 21 years old, were killed on the night of Oct. 17, when a driver who was allegedly speeding west on Pacific Coast Highway slammed into several parked cars on the north shoulder of the roadway. Sheriff’s officials said those parked cars struck the four women, killing them at the scene.

The driver, Fraser Michael Bohm, 22, has been charged with four counts of murder and four counts of vehicular manslaughter with gross negligence. Bohm’s attorney has contended that Bohm was the victim of a road-rage incident on Pacific Coast Highway and was being chased when the crash occurred.

At a recent news conference, local and state officials said 59 people have been killed along the Malibu portion of PCH since 2010. Authorities said infrastructure improvements are being made to bolster safety on the roadway, and the California Highway Patrol has stepped up its presence to boost enforcement.

Infrastructure improvements have included speed limit markings on the road, safety corridor signs, digital “speed feedback” signs, curve warnings and pedestrian signal upgrades. A bill is pending in the state Legislature that would allow the installation of speed cameras on PCH.