Are there any articles about the application of these speed radars?

No.12084264 ViewReplyOriginalReport
Hey guys im curious about how effective these speed radars are.

Im also curious if these have been compared with ones that show pictures.(smiley face when going the speed limit, sad face when going above)

If there is not, do you guys think there is a psychological response to such signs if they present themselves as more "human" or at least using a reward and punishment scheme( in the form of shame, or praise)?