Colectivo from Zihua to Troncones

Assuming that you know where to catch the collectivo van in Zihua, just tell the driver to let you off at Troncones (highway) stop. The last time I took the collectivo in March, the fare (one way) was 37 pesos to Troncones drop-off. Next, you have to take another van to travel into Troncones proper. You walk (carefully) across the highway and wait on the other side of the street for the well-marked Troncones van. I've never waited more than 5-15 minutes. The price is about 25 pesos to downtown Troncones; more if you go to the end of the line at La Majahua. Good luck.