What are the purple flowers along the interstate highways?

The purple flowers commonly seen along interstate highways are often wildflowers such as purple coneflowers (Echinacea purpurea) or various species of asters. These flowers are typically part of roadside vegetation that helps with erosion control and provides habitat for pollinators. Many states also plant native wildflowers to enhance the aesthetic appeal of highways and promote biodiversity. Their vibrant color adds beauty to the landscape while serving ecological functions.