KAILUA-KONA, Hawaii (AP) — The world’s largest volcano oozed rivers of glowing lava Wednesday, drawing thousands of awestruck viewers who jammed a Hawaii highway that could soon be covered by the flow.

The lava was tumbling slowly down the slope and was about 6 miles (10 kilometers) from the highway known as Saddle Road.

It was not clear when, or if, it would cover the road, which runs through old lava flows.

Ken Hon, scientist in charge at the Hawaiian Volcano Observatory, said at current flow rate, the soonest the lava would get to the road is two days, but it will likely take longer.

“As the lava flow spreads out, it will probably interfere with its own progress,” Hon said.

Its smaller neighbor, Kilauea, has been erupting since September 2021, so visitors to the national park were treated to the rare sight of two simultaneous eruptive events: the glow from Kilauea’s lava lake and lava from a Mauna Loa fissure.

The smell of volcanic gases and sulfur was thick along Saddle Road, where people watched the wide stream of lava creep closer.

Lava crossed the Mauna Loa Observatory access road Monday night and cut off power to the facility, Hon said.