Petaluma police plan two DUI/license checkpoints on Friday night.

As is usual, police won’t say where the checkpoints will be.

Typically, such checkpoints stop 1,000 or so drivers and yield a couple of arrests for DUI. More drivers generally get arrested for driving without a license or on a suspended license. Police and anti-drunken driving advocates say the value of DUI checkpoints is more the scare value — getting people not to drink and drive — than the actual arrests.

Funding for the checkpoints comes via a grant from the state Office of Traffic Safety through the National Highway Traffic Safety Administration.

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