Two people were seriously injured in separate roadway crashes that shut down eastbound Sunrise Highway Monday night, one in Nassau and one in Suffolk, authorities said.

In Bellmore, a motorcyclist going south on Bedford Avenue crashed with a northbound truck that was trying to make a left onto Sunrise Highway about 7:30 p.m., shutting down lanes for hours, Nassau police said. The biker, 54, suffered serious chest and leg injuries and was in critical condition at a hospital early Tuesday morning, police said.

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No other injuries were reported, police said, and no criminality was suspected. Both vehicles in the Bellmore crash were impounded, police said.

In East Islip, a male pedestrian was hit by a vehicle just east of Connetquot Avenue, Suffolk police said. He was taken to Southside Hospital in Bay Shore with serious injuries, police said. The crash happened about 8:15 p.m., shutting down lanes for about three hours, authorities said. The vehicle was impounded, police said, and no charges were filed Monday night. Other details were not released.