Muchmore: Brake Lights On?

[Albert Rossi]

Yes, regardless of intention, it does beg the question as to why the limo doesn't appear to slow down in Zapruder.

Maybe that's an illusion? Are there enough background tracking elements to measure speed against?

Well, Alvarez's analysis claims the car slows to 8-10 MPH in the Z film.

Of course, it has been argued that if there were frames removed, then that measurement is invalidated.

I personally have difficulty seeing discontinuity in the car's motion.

But Martin Hay has pointed out that at the point where the brakes are probably engaged, all the occupants of the car actually do move foreward (http://themysteriesofdealeyplaza.blogspot.co.uk), which certainly confirms slowdown, even if not apparent to the naked eye.