David Zipper, a senior fellow at the Mobility Initiative, speaks with WBUR Here & Now co-host Scott Tong about “car bloat,” the trend of increasingly large SUVs and trucks on the road. “I personally believe that car bloat is a major public health issue, it's a major policy issue, but I'll be candid, I don't think the average American does right now,” explains Zipper. “We need people to understand it and appreciate it. And in my view, that's going to need to happen at the grassroots level before we can expect really anybody in Washington to address this problem in the way that it deserves to be addressed.”