By THE STAR STAFF The educational “One Sticker Only” (Un Solo Sello) campaign by AutoExpreso enters its fifth week of in-person outreach this week, expanding its efforts to Puerto Rico’s eastern region. On Saturday, September 26, and Sunday, September 27, AutoExpreso representatives will be at the PR-53 toll plaza in Ceiba, providing drivers with information and assistance on the proper use of the AutoExpreso sticker and the Digital Registration Sticker (Marbete Digital). As part of the…