Into the Switchbacks — a stop on the Coronado Trail Scenic Byway.
This is the section the road is famous for, and it deserves your full attention for the next while.
You are on the tightest, most relentlessly curved stretch of paved highway in Arizona. The curves come one after another with almost no straight between them, many of them blind, some of them switchbacks that fold the road back on itself so completely that you can look across and see the pavement you were on two minutes ago, thirty feet above or below you.
How to drive it well: slow into the corner, look through it rather than at the guardrail, and stay well right — because oncoming vehicles WILL drift across the centreline, and there's often no shoulder and a long way down. If somebody comes up behind you, use a pull-out and let them go; local drivers know this road and it isn't a race.
Watch too for gravel and rockfall on the inside of curves, especially after rain, and for cattle. This is open range in places, which means the cows have right of way and no concept of it.
And go easy on the brakes on the long descents — use a lower gear and let the engine hold you back, or you will cook them. That is not a figure of speech; people burn brakes out on this grade every year.