Vertical Mile Road is actually three miles long, almost continually climbing. I rolled down my windows, leaned my head out my window, and drove very slowly up the hill, tallying the bird songs and calls as I went.
At the very top of the hill, I found a safe place to pull off, and observed for about 5 more minutes. Not a bad checklist for such an unusual methodology!
Checklist for Wheelock:
American Kestrel (male)
Black-throated Green Warbler
Black-throated Blue Warbler