Dalton Pass is the mountainous stretch of road that separates the provinces of Nueva Ecija and Nueva Vizcaya. People going to Sagada via Banaue or Bontoc will pass through this route. My friends and I took this route and we ended up getting stuck for over three hours. This had us behind schedule by almost four hours when it was all said and down. Instead of arriving in Sagada by around 9AM, we ended up arriving in Bontoc (still an hour away) at noon.
There seems to be major road repairs ongoing at Dalton Pass. I suggest that you take the other route (the one that goes through Baguio) to avoid inconvenience.