SAPD investigating after cinder block thrown from highway overpass injures driver below Two families experienced a similar story when their windshields were smashed by an object thrown onto the highway. Author: Troy Kless Updated: 6:25 PM CDT July 13, 2021 SAN ANTONIO — Two women were recently hurt in two instances of rocks being hurled onto a San Antonio highway. The San Antonio Police Department says it's investigating two cases where rocks were thrown from the New Braunfels Avenue overpass onto Interstate 37. One woman was sent to the hospital and members of another family were unharmed. Many people are concerned about safety on the busy highway.