[mlo]

"The motorcade through Dallas was supposed to go through the center of Dealey Plaza along Main Street, but to get to the Trade Mart it would have had to cross a median to get to the Stemmons Freeway."

There is no route from Main St to the freeway. You say it would have had to cross a median, like it was a choice. It would have had to jump the curb and drive over a raised divider.

[Pistolshot]

Yes, it would have had to jump the curb. Kinda uncouth for a President. that is why the change to turn on Hudson and then to Elm.