Imagine you’re cruising down a leafy road at 60mph; sun shining, roof down, all is well. Then you join a busy dual carriageway; there’s more traffic, but things are moving and your spirits remain high. It’s only when you hit the motorway that the journey gets really grim – before you know it, you’re at a complete standstill.
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The motorway is 100% utilised, and now completely useless. What you need is a bit of flow.