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In page Somerset:

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For long-distance holiday traffic travelling through the county to and from Devon and Cornwall, Somerset is often regarded as a marker on the journey. North–south traffic moves through the county via the M5 motorway.[14] Traffic to and from the east travels either via the A303 road, or the M4 motorway, which runs east–west, crossing the M5 motorway just beyond the northern limits of the county.[citation needed]