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Semi truck rollover forces overnight closure of SLO County highway

Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026.
Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026.

Emergency crews responded to a big rig rollover that blocked the highway along the San Luis Obispo/Santa Barbara county line late Tuesday evening.

At 10:42 p.m., a semi truck crashed and fell onto its side, closing both lanes of Highway 166 near Miranda Canyon Road, according to a post on X from Cal Fire.

Work crews were able to secure the scene and mitigate all hazards related to the incident, according to the post.

Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026.
Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026. Courtesy of Cal Fire

While there was an initial concern about a potential fuel leak that would have required a larger hazmat response, it was later determined to be a motor oil spill, which was contained to the roadway and cleaned up by the morning, Cal Fire public information officer Eva Grady said.

Cal Fire units were on scene all night, and the location of the crash was cleared by the morning, according to the post.

No other vehicles were involved in the crash, Grady said.

Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026.
Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026. Courtesy of Cal Fire
Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026.
Cal Fire responded to a big rig rollover on Highway 166 near Miranda Canyon Road at around 10:42 p.m. on Tuesday, April 28, 2026. Courtesy of Cal Fire
Joan Lynch
The Tribune
Joan Lynch is a housing reporter at the San Luis Obispo Tribune. Originally from Kenosha, Wisconsin, Joan studied journalism and telecommunications at Ball State University, graduating in 2022.
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