So...I built this gate/arbor...

[HereSince1628]

6. Looks great...one comment from a patio project that gets some car traffic...

I put in a patio between a house and a garage, because the patio ran next to a driveway it was sometimes driven on while making a sharp turn around a corner of the house. 4 inches of sand over 6 inches of gravel didn't support even a little car traffic very well. You might want to check on crushed stone mix that can be compacted as the base.

on edit...as long as depressions don't develop along the tire tracks, it appears that the slope is adequate to move the water away, I've got something like that slope on my yard away from the house and I get similar amounts of rain per year. It also doesn't seem so steep that it would present a problem with the pavers wanting to slide downhill under the weight and traction of a vehicle.