UPDATE (5:42 p.m.) - The fire is 100% contained.
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UPDATE (3:55 p.m.) - The fire burned one acre and was 75% contained as of 3:05 p.m., according to CAL FIRE.
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(1:33 p.m.) - Firefighters responded to a semi-truck fire along westbound Highway 46 between Cambria and Paso Robles on Friday.
The fire broke out just before 1 p.m.
According to the California Highway Patrol, the truck, which was loaded with rocks, was completely burned.
The flames spread to vegetation along the right side of the highway.
As of 1:25 p.m., the fire had burned about 1/4 acre, according to CAL FIRE.
Travelers should expect slow traffic through the area.