Smuggling map found in desert

Got this from a buddy of mine who was out patrolling the desert today. Seems a smuggler dropped his map. Notice the red and yellow lines. He is trying to figure out what the different colors mean. I'm thinking the yellow line is Plan B if Plan A(red lines) goes to hell.

More and more traffic is coming up through the Tohono O'Odham Indian reservation west of Three Points as Border Patrol manpower in limited. The reservation does have an all Indian group called the Shadow Wolves who are worth their weight in gold. Top notch first class trackers who will track for days at a time if need be.