There appears to be a long-term decline in car usage per head, since at least the early noughties;.
That statement is a little deceptive after reading the rest of your post - per head perhaps, as a volume, not in the slightest - we have had a volume drop in the last couple of years, which will return to the trend soon, as to the significance of a per head figure ? A lane satuarates at 1800-2100 ish, doesn't matter about per head, it's all about actual volumes
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