I will suggest the inclusion of speed reducers commonly used in Brazil, called "lombadas" or "quebra-molas" (speed bumps). These elements are rarely well signposted.
Are a ridge set in a road surface, for purposes to make drivers to reduce speed.
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Eduardo Lúcio Amorim Costa commented
The speed bumps are a serious risk to life in countries like Brazil because many are not even signaled on highways. We consider this functionality to be of the utmost importance.
Lisa Ldriveskier commented
I think it would be useful in SOME situations where there are very large speed bumps on public roads that affect a lot of traffic and are difficult to see, especially when it is dark outside. It would be overkill to map every speed bump, especially in parking lots.