Again, I'm going to push you. I think car-free days are wonderful. The first I ever experienced was about 20 years ago when I was in Brussels, and I was wandering around thinking—[Interruption.] Well, no, I don't share some of the phobias that are present in certain parts of the Chamber. [Laughter.] But I remember feeling, 'What's strange? What's unusual' and then I thought, 'Gosh, I can hear children playing.' That's what I could hear, because there was no traffic noise. But these are one-offs, aren't they? What we need is a much more ambitious strategy. A recent study found that, if the average speed of urban traffic fell by just 4 kph from, say, 16 kph to 12 kph, there's a 10 per cent increase in pollution in diesel cars and vans, and 25 per cent in buses and trucks. It is absolutely crucial that we reduce the amount of motor traffic and also improve its flows. I'm very sceptical of the initiatives that we occasionally see from the Welsh Government. I don't mind the car-free days in our cities, but the recent one—to open bus lanes to heavy goods vehicles, so that that's a way of improving traffic flow—does seem to me to miss the point. We need a strategy to get heavy lorries, at least in peak times, off our roads. There are other forms of delivering goods in city areas. You get that all around the continent now—the spoke and hub arrangements, with smaller vans taking in the goods into cities and not relying on these enormous articulated lorries. We need a more structured approach. We need an urban strategy so that we are clean-living places, and we need a clean air Act. When are we going to get it?