A bicyclist was seriously injured when he was hit by a vehicle in Menlo Park near the Dumbarton Bridge on Monday morning, police said.

The collision was reported at Bayfront Expressway and Marsh Road at 8:23 a.m., police said.

Officers arrived to find the injured bicyclist, a 33-year-old man, police said. He was taken to Stanford Hospital.

The driver of the vehicle, a 33-year-old Union City woman, remained at the scene and cooperated with investigators, police spokeswoman Nicole Acker said.

A preliminary investigation indicated that she was not under the influence of drugs or alcohol, according to police.

Westbound lanes of Bayfront Expressway were closed until 2 p.m. as police investigated the incident, Acker said.

Anyone with information about the collision is asked to call Menlo Park police at (650) 330-3600.