I'll just leave this: https://youtu.be/Nv_LN2Nq2Es?si=UD6jlVA-lAqB6q1a

According to a study conducted in 1000 cities in 50 countries based on data from connected vehicles and phones. Not disagreeing with the premise but I expect there are plenty of other more "congested" cities, visit Manila or Jakarta for example. The UK should however definitely do more to fund its public infrastructure.