This story has been updated.
The crash, at Exit 4, was reported just before 5:30 p.m. with the delays stretching back to Route 22 (Exit 3).
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A motor-vehicle crash that initially blocked the left lane on northbound I-684 in Bedford led to stop-and-go traffic Wednesday evening.
The crash, at Exit 4, was reported just before 5:30 p.m. with the delays stretching back to Route 22 (Exit 3).
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