Beyond the bridge, I-393 ends and US 4 and US 202 merge down to a single lane before joining NH 9 and continuing eastward.
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The primary purpose of the road is to bypass a densely built commercial strip on Route 9 in the eastern part of Concord.
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When I-393 was first completed circa 1979, it ended at an at-grade intersection with NH 9 and NH 106 just west of where exit 3 now stands.
The western terminus of NH 9 is at the Vermont state line in Chesterfield, where it connects to Vermont Route 9.
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