Officials discover 'significant void' below New Jersey interstate where sinkholes keep opening | 27 Feb 2025 | A "significant void" sits just below the pavement of a New Jersey highway that's been beset by random sinkholes over the last few months -- and state officials say it may take a while to repair. The New Jersey Department of Transportation has closed Interstate 80's eastbound lanes in the Morris County town of Wharton twice in the last three months after reports that the ground was falling away. In one of those instances, a mammoth sinkhole the size of a four-story building opened up on the highway shoulder in December, closing lanes for nearly four days while workers scrambled to fix it. Now, officials say they've figured out why this keeps happening -- a void exists just below the surface of the roadbed near Exit 34, according to NBC 4 New York.