This jump is impossible to be accomplished in the ordinary way on the mobile version of the game, because the PCJ-600 is slower.
*It's important that you save your Freeway on the Vercetti Mansion garage and walk/run towards it after positioning the Packer, because it will disappear if you drive a car to get there.
** Sorry for the horrible aspect ratio. Used the app "screen recorder" to record the screen and am too lazy to record it again with a different app.
