A truck hauling a power transformer crashed on the Long Island Expressway Thursday night, backing up traffic as authorities waited to remove debris, Suffolk police said.

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The transformer fell onto the westbound lanes by Exit 60 in Lake Ronkonkoma about 7 p.m., police said. The crash shut down the three main lanes, but traffic was able to move past on the HOV lane and the HOV shoulder.

By 9 p.m., only the right lane and ramp remained closed, police said. Other details, including what caused the crash, were not immediately available, police said.