I’m not sure if there’s an objective answer to this question, but in my experience as a movie fan there are two reasons the production would make the road wet:
1. For aesthetics. Light bouncing off of shiny black tarmac looks nice.
2. To perform driving stunts. In car chase movies (specifically from the 1970s) they would wet the road to make it easier for the cars to slide/drift around corners. (looks a little corny when just the corner patch is wet)
In one of the more recent James Bond movies I remember hearing they soaked the road with Coca Cola to actually make it grippier (I think the bridge chase sequence where it’s all brown and beige) so there are a lot of reasons to soak a surface in filmmaking
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