Bus ridership in Hillsborough County continues to rise, and 2015 is on track to see more than 15 million passenger trips, officials said. The Hillsborough Area Regional Transit Authority released its latest numbers last week, touting an increase of almost 6 percent in boardings for December 2014 compared to the previous year. Overall, 2014 was a record year for ridership, HART said. December alone saw 1.27 million passenger trips. "Public transit in Hillsborough County continues to improve, and I encourage people who haven't been on a bus lately to give it a try," said HART CEO Katharine Eagan.