SOUTH PORTLAND — A 39-year-old Scarborough man apparently will survive injuries he received when he crashed a motorcycle on the Veterans Memorial Bridge in South Portland Thursday.

The man, who is originally from South Carolina but was staying locally, had borrowed the motorcycle, police said.

Authorities said the man, who was not wearing a helmet, received head injuries.

The man was taken to Maine Medical Center where he remains in serious condition, police said. Police have not released the man’s name because they want to confirm his identity. He had no identification with him and police have not been able to interview him.

Witnesses told police the man was seen using the breakdown lane to pass several cars on the on-ramp to the bridge when he lost control. It appears that speed and alcohol were factors in the crash, police said.