A coach is on a smart motorway in heavy rain with spray reducing visibility. Traffic ahead passes a matrix sign warning of congestion. What should the driver do?

1. Increase following distance, reduce speed progressively, use lights appropriately, and watch for sudden queues
2. Keep speed because the coach is high enough to see over spray
3. Follow close behind a lorry to use its lights as a guide
4. Use the hard shoulder to avoid the spray