Over the weekend former stripper Blac Chyna was arrested in Austin, TX for public intoxication [click here if you missed that].
According to reports Rob Kardashian drove 20 hours to go pick her up...
Rob Kardashian drove 1,377 miles -- from L.A. to Austin -- to personally extricate freshly freed girlfriend Blac Chyna from the Lone Star state.
Our Kardashian sources confirm ... Rob drove his Bentley 26 hours to pick Chyna up. He started the journey minutes after Chyna got arrested for public intoxication at the Austin International Airport Friday at 4:20 PM Texas time -- 2:20 PT.
This pic was posted at around 12:20 PM PT -- 22 hours after her arrest.
Our sources say the Kardashian family is alarmed ... they believe the road trip is a clear sign Rob's acting irrationally, and they're worried drugs or alcohol might be involved.