Wickenburg, Arizona Roadblocks

On 11-30-2011, I was traveling south on 93 and just prior to the off ramp for Route 71 at about 3:30 pm and I noticed a small sign placed on the left side of the road stating “Narcotics Check 1/2 mile”. I slowed down, and as I went over the overpass over Route 71, I noticed several police and sheriff vehicles parked to the left. There was no stopped vehicles and I just continued on. I did see several police vehicles just after the parked vehicles. I did see a northbound vehicle stopped and talking to the officers. I believe that they were watching for vehicles to turn around or exit on route 71, or maybe the checkpoint had stopped for the day. I have driven that route many times and this was the first checkpoint I had ever seen.