Technology to prevent wrong-way drivers is being tested in Danbury.  The state Department of Transportation is installing the video software   detection device at the Exit 8 westbound off-ramp.  The Newstimes reports that flashing lights will activate on existing 'do not enter' and 'wrong way' signs to get the driver's attention.  The 250-thousand dollar project is being installed as the DOT replaces aging traffic signals.  DOT spokesman Kevin Nursik said in the published report that Danbury was chosen because of the confusing intersection configuration, and because three crashes have been reported there involving wrong-way drivers over the past several years.  If the pilot program is a success, the technology could be expanded across the state.