When driving past roadside puddles or flooded street gutters where pedestrians or cyclists are present, what civilized driving behavior is required?

1. Speed up to clear the standing water quickly before other cars arrive
2. Sound the horn loudly so pedestrians jump away from the puddle
3. Decelerate to a low speed (减速慢行) to prevent splashing water or mud onto pedestrians
4. Maintain highway speed and steer onto the sidewalk