LARRY A. SNEED A high school U.S. history teacher in Georgia for thirty-five years, Sneed became an assassination researcher in the early 1980s and recorded over sixty hours of interviews with eyewitnesses and law enforcement officials between 1987 and 1992. He published first-person narratives of those oral histories in the book No More Silence(1998). Recorded November 2, 2009.
T E Moore told Sneed that the first shot was when JFK was level with the highway marker, ie just past the signals. This is i think the best witness evidence that we have re where Oswald's shot-1 happened. And it confirms that shot-1 was time-wise at Z113, & that JFK was from Oswald's view in line with the signal arm. Here is the excerpt from Sneed's book.
Here we can see the highway marker, just past the signals.