See Section 2.1, Vehicular Channel Models, in the 1x-EV-DV traffic modeling methodology. This methodology was used - essentially - for modeling 1xEV-DO and 802.20 / UMB, and I believe, LTE.
Note there are 2 vehicular models (30 kph and 120 kph) but the 2nd one is typo'd as a "pedestrian" model - this is not the final draft of the eval methodology paper, you might want to search for V14 which I think is the final draft. If you can't find it you can email me and I have a copy somewhere on another computer.