Drivers on the Memorial Causeway Bridge may notice more police officers than usual late Friday night and early Saturday morning. As part of a national effort to reduce drunken driving-related crashes, police will be conducting sobriety checkpoints. Motorists leaving Clearwater Beach may be detained so police can check for drunken driving and other motoring infractions, according to Clearwater Police Traffic Enforcement Team Sgt. Steve Burch. The checkpoint will be conducted from about 10 p.m. Friday until 3 a.m. Saturday. For information, call department spokesman Wayne Shelor at 462-6280.