A road that was due to stay closed until the end of November has reopened about two months ahead of schedule.
About 150 residents of Troon, near Camborne, held a protest in May asking Cornwall Council to fix Newton Road as soon as possible after a hole appeared, thought to be caused by a mineshaft opening up.
The alternative route forced drivers to take a seven-mile (11.3km) diversion through Four Lanes.
The Local Democracy Reporting Service said residents were "delighted" after the road reopened on Friday.
Rachel Goodman, of Troon Residents' Action Group, said: "I have never seen so much action on the village Facebook pages, residents are truly delighted to be able to exit and access Troon without a seven-mile diversion.
"Cornwall Council Highways have really done the village proud and we are very grateful to have access restored."
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Local Democracy Reporting Service
Cornwall Road Reopens Two Months Early After Mineshaft Damage