CLAYTON -- A motorcyclist suffered serious injuries and a woman was arrested on suspicion of driving under the influence in a major crash that shut down a section of Clayton Road on Thursday.

According to police, the female driver of a gold-colored Toyota Corolla crossed over the center divide and hit the motorcyclist head on. Details are still emerging on the collision, but police did confirm the woman was taken into custody and that they believe she was driving under the influence of alcohol and possibly drugs.

The extent of injuries in the crash is still unknown.

The collision was first reported shortly after 6 p.m. and traffic delays are being reported in both directions along Clayton Road while crews investigate and clear the scene.

Check back for updates.

Staff photographer Susan Tripp Pollard contributed to this report. Contact Katie Nelson at knelson@bayareanewsgroup.com or follow her at Twitter.com/katienelson210.