Click on the map to read about the country's congestion hotspots.
Introduction
A top government transport adviser has warned that attempts to reduce road congestion are doomed to fail because the cost of motoring is set to fall as public transport fares rise.
A nationwide satellite charging system, more charging zones in major cities and tolls on individual roads are among the long term solutions under discussion.
Meanwhile, congestion continues to cost the UK economy an estimated £20bn a year and travellers continue to suffer frustration and delay on key routes across the country.
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