A motorcyclist was critically injured Tuesday night after crashing into a vehicle at the intersection of Stoneridge and Chabot drives.
Pleasanton police officers responded to the area around 6:10 p.m. and all involved parties were on scene.
The motorcyclist was provided medical care by Livermore-Pleasanton Fire Department, then transported to Eden Hospital with life-threatening injuries.
Police said the driver of the vehicle is cooperating with the investigation.
As of 10:20 a.m. Wednesday, the motorcyclist is reported to be in "stable but critical condition," said Sgt. Joe Leonardo.
Stoneridge and Chabot drives were closed for approximately four hours and reopened at 10:30 p.m.
Anyone with information about the crash can call 931-5100.