What is the correct protocol when driving a heavy commercial truck through a flooded roadway or shallow river crossing (涉水驾驶)?

1. Stop to verify water depth and bottom firmness, select lowest gear, drive steadily at low speed without shifting or stopping, and gently pump brakes afterward to dry them
2. Accelerate in the highest gear to create a large bow wave that pushes water away from the engine
3. Turn off the engine and let local villagers push the loaded truck across the river
4. Drive along the deepest center line with high beam lights on and windows rolled up tightly