Bali is much closer to the equator, and as you might have guessed, it's hot. You get used to the heat however, despite coming from the middle of winter in Brisbane. Sweating buckets on most days becomes part and parcel. We only experience that half of the year here, but Bali is just always hot and humid. When everyone feels it all the time, it no longer becomes an issue. Another more modern aspect of Indonesian culture is that given the small and often unmaintained roads, the most common vehicles you'll see are scooters and smaller versions of people movers and vans.
As far as we could tell, there are no road rules in Bali. The traffic simply flows according to the attentiveness of each and every driver. Although this often causes long delays, I never once saw any vehicle collide nor any pedestrian struck. It was almost liberating in comparison to the strict, safety first, zero freedom rules we have in Australia. Roads have lanes painted on them and there are traffic lights in some built up zones, but it's really more of a guide.