Linda; Yes, I thought there might be some around. I was surprised that I didn't run into any on my recent trip over there, but then again, I tended to head north from Leyland so I didn't get into any BIG cities.
Our freeways, in the greater L.A. area criss-cross the whole region, dozens of them, and if you can imagine that from Santa Monica in the west, to San Bernardino in the east, a distance of about 75 miles, if you were to travel that distance on the Interstate 10 freeway, you would never encounter a field. Urban sprawl gone mad. [

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Therefore the freeway system goes
through our cities rather than skirting them as does your motorway system. The M6 for instance goes nowhere near downtown Preston, or Lancaster. Hence the controlled entry at peak periods is required here, as it probably is in the Manchester-Birmingham-London areas.
But believe me....you're next. [}

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PS: We just had an earthquake, nothing big in this area, but I don't know where the epicentre was [B)]