There was no warning that I was aware of, or I surely would have avoided it. It was on a major highway where I live. I was never actually stopped. When the cops saw me in a mini-van with a wife and two kids sleeping in the back, they waved me on through. I waited for an hour to get to the checkpoint so I could be waved through.
"There was no warning that I was aware of,"
That you were aware of is the Key here.
"Planners should remember to select a site that allows officers to pull vehicles out of the traffic stream without causing significant subjective intrusion (fright) to the drivers (United States v. Ortiz 422 U.S. 891 (1975)) and/or creating a safety hazard, e.g., by creating a traffic backup."
"To obtain maximum benefit in terms of its general deterrent effect, sobriety checkpoints should be publicized aggressively."
"Public reaction - This can be measured by immediate feedback received by officers at the site of the sobriety checkpoint. Also, a short questionnaire which includes an explanation of why the checkpoint is conducted, given to drivers stopped at the checkpoint, can provide data. It may ask of the driver such questions as; Does the driver believe the checkpoint is fair? Did the driver mind being stopped briefly? Did the driver feel checkpoints help deter driving while impaired? The response can be completed later and mailed back to the agency. "
You might like to read this :
http://www.nhtsa.dot.gov/people/injury/alcohol/Checkpt.html
I would offer to you that whomever conducted the roadside saftey check you went thru would find your information valuable in setting up future checkpoints.