When road surfaces are wet or icy, what should a bus driver do?

1. Keep the normal dry-road gap when ABS is fitted because the system will control wheel slip for the driver
2. Brake firmly in a straight line at each hazard so the system can test the available grip
3. Use the retarder at its highest setting on ice because it does not use the service brakes
4. Reduce speed, increase the following gap and use steering, braking and acceleration smoothly