That is definitely during the rainy season although that just means it rains slightly more often than normal. Roads are pretty good in most places.
I've driven up the west coast of sumatra and didn't have any trouble with the roads. One place around Lahat was pretty bad but generally the roads are good. In south sumatra only travel in daylight though. Lots of bandits in the area.
I highly recommend Bengkulu and Bukkit Tinggi. Danau Toba was nice too.
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