Alas, something similar happened last September as a truck descending the Angeles Crest Highway lost its brakes, barreling into a coffee shop parking lot next to the doomed bookstore, mangling seven vehicles. No causalities then, but Cal Trans was notified by La Cañada authorities that these big rigs need slowing. Cal Trans jumped right on it and will, no doubt, cook up something within the next geological epoch.
Our prayers go out to the victims and survivors.