It's a built up and hectic part of Chalong, not sure why it says Rawai. I drive this stretch of road everyday.
There are lots of side roads on this stretch with alot of residential units, restaurants, accommodation, 7/11, weed shops, bars in the area.
At that hour of the morning it's fairly quiet, the road gets busier between 6-7 as hotel workers are on their way to and from work but this is earlier than that . Can only guess the driver was coming home from a night in Patong and speed/stimulants were involved. During the day there are bikes zig zagging every which way but not at this hour.
Phuket roads are lethal