A crash involving a pickup truck carrying pool chemicals prompted closure of the northbound 170 Freeway in the North Hollywood area for about four hours Friday.
The crash was reported about 9 a.m. at Sherman Way, according to the California Highway Patrol.
Hazardous-materials crews were sent to clean up the chemicals, a process that was continuing early Friday afternoon, the CHP reported. One person was examined for a possible injury.
All northbound lanes were closed until about 1 p.m., when two of the lanes were reopened, according to the CHP.
The circumstances of the crash were under investigation.