Seven Springs Blvd near 54 - Slight Detour

Be prepared to change lanes going North on Seven Springs Blvd today.  The intersection of Seven Springs Blvd and Daggett sunk in again - I believe it is three times - and major repairs are in process.  We had been noticing a slight dip but yesterday that dip turned into a large depression - large enough to cause major damage to the car if we had gone over it.  The street light near Gorman and Seven Springs has been out for months and we were concerned that cars would miss the lineup of orange barrels to turn into the next lane - especially since 75% of the cars DO NOT SLOW DOWN.

Anyone know why this area of the road repeatedly caves in?  I am afraid to guess.