The Putnam County Sheriff's Office and Carmel Police have stepped up DWI patrols this Memorial Day.  The high visibility campaign started on Friday and will end tomorrow.  Memorial Day is one of the busiest travel holidays of the year and marks the unofficial start of the summer.  Sheriff Robert Langley says the highly visible and highly publicized effort aims to further reduce incidences of drunk and impaired driving.  He urged people out marking the holiday to make a difference and have a plan.  The Sheriff's Department has a mobile app with that name so people will always be able to find a safe ride home.