The reason this happens in March and September is for marketing. The car companies bullied the government into that schedule — it was meant to be January and July.
People tend to buy most new cars in the Spring (so it stays cleaner and has less road salt and corrosion in its early life), and also when the manufacturers announce next-years models at trade shows in the Autumn. And people like to have new year-plates on the new cars, just to show off to the neighbours.
This kind of backfired, because it accentuates two peaks in the sales. It would really be better to smooth out production throughout the year.
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