Checkpoints across Oahu will look for impaired drivers throughout January and February.

The Honolulu Police Department says the checkpoints will be set up at unannounced times and locations through Feb. 29. The checkpoints are part of an ongoing effort to crack down on collisions on the island’s roads.

As of Dec. 28, 52 people have been killed in 50 traffic collisions on Oahu in 2011. Speed, alcohol and or drugs were factors in at least 19 crashes. During the same period in 2010, 63 people were killed. Speed, drugs and or alcohol were contributing factors in 29 of those collisions.