A more thorough explanation:

Definition: A sobriety checkpoint is a location on a road where police officers set up a roadblock to stop drivers and check if they are driving under the influence of alcohol or drugs.

Example: During holidays or special events, police officers may set up sobriety checkpoints on busy roads to prevent drunk driving accidents. They will stop drivers and ask them to perform a breathalyzer test or field sobriety test to determine if they are sober enough to drive.

Explanation: Sobriety checkpoints are used as a preventative measure to reduce the number of drunk driving incidents on the road. By stopping drivers and checking their sobriety, police officers can identify and remove intoxicated drivers from the road before they cause harm to themselves or others.