Stephen Osman / Los Angeles Times
What caused the deadly pileup on Interstate 5 near Santa Clarita on Friday? Truckers have previously complained that the tunnel shown ablaze here is difficult to navigate. Caltrans officials are looking at whether the speed limit in the area is too high. And rain might have been a factor, too. This much is clear: 31 vehicles were involved, and three people died in the inferno.
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