First of all, the 44 m.p.h. speed was brought up by someone else in this thread. Your lookalike brought it up and you dumped it on me. Secondly, it is a moot point since the two turns were added to make sure that JFK didn't travel down Main Street at a faster rate of speed.
The unnecessary two turns are the issue, but of course you don't want to tackle that issue.
So far, all you've managed is to claim that Elm must have been as wide as Main because a schematic map of West downtown Dallas shows it that way. However, the same schematic shows that the on-ramps to Stemmons are as wide as Stemmons istelf, and that Main and Elm are both wider than either side of Stemmons. It's not a reliable indicator of how wide the streets were.