An 18-wheeler crash in New Braunfels on Tuesday, March 17, has led to the closures of a portion of the Interstate 35 southbound access road that runs through the city. An 18-wheeler crash in New Braunfels on Tuesday, March 17, has led to the closures of a portion of the Interstate 35 southbound access road that runs through the city, authorities said in a Facebook post. New Braunfels police said the closure is expected to last several hours and are asking for patience from drivers.