When driving a taxi on icy, snow-packed winter roads, how should the driver control vehicle speed and braking to prevent uncontrollable skidding and loss of control?

1. Slam on the brakes hard whenever turning a corner
2. Reduce speed by over 50%, increase following distance by 3 to 4 times, avoid abrupt steering, use engine braking, and apply gentle progressive braking
3. Disengage the clutch and coast in neutral at high speeds
4. Accelerate quickly from a dead stop in first gear with full throttle