I thought I illustrated just that with my 'story'. So let's extend it a little. This is the road: A-City--------------------------B1----------B2---------B3---------B4----------B5--------------------B-Town The B's are the bridges, all built 70 years ago according the same design. The problem: traffic and the weight of trucks, tractor etc have increased, and the bridges are not built for heavy weights. So to avoid problems two measures are taken: the road is only allowed for vehicle
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