1. type of game (single player, multi-player, p2p hosting or client, rented dedi)
2. what mods?
3. screen shots or video showing this
4. coords from the F3 screen such as 1000 61 1000 (proper format is in the F3 along with seed name)
5. which alpha build (needs to be a16.4b8 or above)
6. try using new seeds if you havent
without this info, then you are only telling us you have a problem... none of my maps in a16.4b8 nor my rented dedi has this (speaking about the 300' roads)
the plateaus are a known issue in a16.4 RWG but we should not be seeing 300' roads