A semi-circular tunnel is
Semi circle, with rectangle inscribed, labeled as follows: top side, 22, right side, 24 with question mark. Line segment passing through the vertical center of rectangle, from base to top point on the semi circle, labeled 26.
Added to diagram, diagonal from center bottom, to top right vertex, of rectangle, creating right triangle, labeled as follows: horizontal leg, 11, vertical leg, approximately 23.56, hypotenuse, 26.
If he drives down the center of the road, the height of the tunnel at the edge of the house is only approximately