This is mainly for its bumpy or potholed surface, mostly due to worn concrete surfaces. Melbourne in the early 1850s was a rough and primitive place with potholed roads. On the other hand, they can be used in very narrow or severely potholed streets. The streets were potholed, to the point where there was at least one fatal drowning. The road is not very good, with a lot of potholed sections. From above they noticed the distinct patterns of potholed peat which are devoid of trees. Mining is generally abandoned when more than about 40% of the raise line is potholed.