Highways need 4 lanes per side - A NASCAR wannabe lane, a normal driver lane, an old people who drive 40 in a 70 lane, and a "Where in the hell am I?" lane.
I don't blame Mexicans for boarder hopping. We did something subliminally messed up to them. When we were creating our country, just above Mexico, we created a state called New Mexico. Now what Mexican wouldn't want to check that out?