To be fair, there are plenty of reasons to avoid DUI checkpoints even if you're not driving impaired.
They tend to substantially slow down traffic, for one.
They tend to substantially slow down traffic, for one.
Where society's need is great and no other effective means of meeting the need is available, and intrusion on people's privacy is minimal, checkpoints toward that end may briefly detain motorists. In Michigan v. Sitz 496 U.S. 444 (1990), the Supreme Court allowed discretionless sobriety checkpoints.
Although what I'd really prefer is not a separate app I have to consciously check, but integration with a GPS routing device, the way some of them can use real-time traffic info. Just let me program in a police-roadblock penalty (say, call it equal to 30 minutes of traffic), and then reroute based on the real-time roadblocks info; that way I routinely avoid police roadblocks in my daily life without having to think about it.