On the A20 near Nieuwerkerk aan den IJssel it starts to rain hard. You are driving an empty car without a trailer behind a van. Which following distance is the guideline here?
About 4 seconds: in rain you double the usual 2 seconds
About 3 seconds: the rain alone is already a reason for more distance
About 2 seconds: 3 seconds applies only with a load or a caravan
Explanation
False — you think only a load counts. Rain, snow and fog are each on their own a reason for 3 seconds, just like a heavily loaded vehicle or a trailer or caravan (Book p.124).