At 7:10AM we arrived at the toll road from Mex 1-D to the Otay Mesa border crossing just east of Tijuana.
Three burned out cars and 5 SSP Policia Federal pickups and a pumper fire engine. One of the local transitos told us the road was blocked at around 4AM the occupants of the cars were supposedly robbed then the cars were set afire. None of the 3 looked newer than I'd guess 2008.
My Mexican friends were puzzled as well. Why were these people robbed? Why burn the cars? A mystery.