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A motorcyclist suffered critical injuries Monday when he rode into a garbage truck near Antioch, according to the Lake County Sheriff’s Office.

The man, a 35-year-old Spring Grove-area resident, was brought to Advocate Condell Medical Center with what police said were life-threatening injuries. His identity has not been released.

Police said the collision happened at about 10:25 a.m. on Grass Lake Road near the Grass Lake Bridge.

The truck driver was eastbound when he slowed to make a left turn into a parking lot. The motorcyclist was trying to pass on the left and struck the rear of the truck as it completed its turn, according to authorities.

Speed appears to be a factor in the crash, police said. The cyclist was not wearing a helmet, according to reports.

The garbage truck driver, an Ingleside resident, was not hurt and cooperated with police.