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In this paper, the authors study the information propagation process in a 1D mobile ad hoc network formed by vehicles Poissonly distributed on a highway and travelling in the same direction at randomly distributed speeds, independent between vehicles. Considering a model in which that time is divided into time slots of equal length and each vehicle changes its speed at the beginning of each time slot, independent of its speed in other time slots, they derive analytical formulas for the fundamental properties of the information propagation process and the information propagation speed. Using the formulas, one can straightforwardly study the impact on the information propagation speed of various parameters such as radio range, vehicular traffic density and the time variation of vehicle speed.
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