Vehicles streamed slowly through a well-lit, cone-created single lane along eastbound Chapman Avenue, just east of State College Boulevard late Thursday … 671 vehicles, to be exact. The purpose: a DUI/driver license checkpoint conducted by the Fullerton Police Department. While the main intention of such pre-publicized sobriety checkpoints is to deter would-be impaired drivers and to educate the public on the dangers of drunk driving, the operation did yield some arrests. Of the 671 vehicles that passed through the checkpoint on Sept. 1, 334 drivers were contacted by officers. Of those, three drivers were arrested on suspicion of DUI, two…