Be careful out there.

Fairfax County Police will be conducting a Sobriety Checkpoint on Saturday, April 23 in the Reston District from 11 p.m. to 2 a.m. (Sunday). Police do not give advance notice of the exact checkpoint location.

The Reston District is 56 square miles. It includes Reston, along with Great Falls, and parts of Vienna, Oak Hill and Herndon.

The Fairfax County Police Department puts up occasional sobriety checkpoints to make sure drivers are not drinking alcohol and getting behind the wheel.

Along with publicity and awareness, checkpoints have proven to be effective in the fight against drunk driving, police say.