The overall look is good, but it's broken as i said before.
Its not broken, I have this map.
Anyways, it is bad because there is a part where the road comes back to make a crossroad, but at that section, the blocks are diagonal to the road.
Well, here's a picture. Its not a really good one, but it'll do.
As shown, the road goes in a loop, but the bricks placed will look the way that box is drawn in the picture. That makes it difficult to make a bridge or ramp over, and so, ruins the racetrack.