So the group that didn't punish anyone for violating rules wouldn't let non-believers of the official theory copy their manual. Say it isn't so.
In other words, no one can provide any support for the 44mph claim. I've asked repeatedly, and no one has ever been able to substantiate it.
You can mock Fletcher Prouty all you want, but he was the Air Force's CIA liason and worked on numerous presidential trips in regards to security. What are your qualifications?
He was also a crack investigator for the Church of Scientology who "found" that L Ron Hubbard was a super-secret double-nought agent for the ONI in WWII. He first achieved public notice by claiming that Alex Butterfield (who oversaw the installation of the soon-to-be infamous taping system in the Nixon White House) was a CIA plant. He associated with Neo-Nazi sympathizer Willis Carto and Carto's Liberty Lobby.
He was AF liaison with the CIA, not the Secret Service, and IIRC, no one has ever been able to substantiate his claim that he'd been involved in Presidential security, or explain what his role would have been, or show that he would have been exposed to the rules and standards that he claimed to be familiar with.
AFAIK, no one has ever been able to independently corroborate Prouty's claims about Presidential motorcade security.
There was NO need for those turns. End of story.
The motorcade moved at parade speed, about 15mph. At that speed, those turns would have done little to slow the limo down, even with its extra length. That is, the point you're trying to make isn't really much of a point. Anyway, if reducing the President's vulnerability was the priority, they wouldn't have gone to downtown in the first place; they would have gone from Love Field to Mockingbird to Harry Hines, thence the Trade Mart, avoiding the extra trip downtown altogether.