Personally, I believe the absent turn onto Elm St also has to do with the total time the JFK Limo was physically on Elm St. I believe when making that (L) turn, driver Greer was confused as to whether he was supposed to make a lazy (L) turn and proceed down the Elm St Ext, or make a hard (L) and go down Elm St. (There are rumors of the JFK Limo almost jumping/bumping the curb/Island). The longer the JFK Limo is physically on Elm St, then slows down the calculated avg MPH of the car while it was moving down Elm St. And, the calculated MPH of that car is entirely based on the Current Zapruder Film and its' 18+ frames per second. The slowing of the avg MPH of the JFK Limo makes obvious that it was down to a crawl at the minimum. This then validates the "rolling STOP" cited by many eyewitnesses including DPD Motorcycle Officer Hargis. (This "rolling stop" being totally ABSENT from the Current Zapruder Film). Photog Wiegman capturing the JFK Limo going under the Triple Underpass AFTER he jumped out of Camera Car #1, and then ran down Elm St, makes it clear that the JFK Limo was on Elm St longer than the Current Zapruder Film leads us to believe. There is no perfect crime. Wiegman's filming of the JFK Limo going under the Triple Underpass revealed that the JFK Limo was on Elm St much longer than the Current Zapruder Film purposely misleads us to believe.