The valley cliffs are marvellous
But I noticed something:

The last two blocks in the folder (3)-1-4 have no symmetric counterparts.
The block number 5 and 6 are asymmetric variant of each other (the upper two blocks in the picture), while number 5 and 6 are different. One has the 90° turn at the bottom and then the uphill part and the other one is exact the other way around. But they are no symmetric counterparts
EDIT: For the offroad blocks there is only the block number 7, but it has a symmetric counterpart (which is then 8 in this folder). But the block 8 in the road folder is missing entirely in the respective offroad folder
Additionally, I think it would be cool to have a steep slope (similar to the red encircled area) as a single standalone block. In the picture above it is slightly s bend and together with a 90° turn. A single steep slope could be really useful for jumps.
Anyways, thanks a lot for these amazing objects. Keep working
