This is on the hill coming down into White Sand beach. The van driver went straight on the final bend before you reach KC Grande Resort, he should have taken a sharp right turn. Seems to be due to either driver error or faulty steering as it wasn’t raining at the time, the road appears fairly dry and it happened in daylight.
These passengers, a Thai group, were lucky as the roadside only drops down a few metres here on the inland side of the road. The drops are much longer on the opposite side.