  The fleet management of mobile working machines with the help of connectivity
can increase not only safety but also productivity. However, rare mobile
working machines have taken advantage of V2X. Moreover, no one published the
simulation results that are suitable for evaluating the performance of the
ad-hoc network at a working site on the highway where is congested, with low
mobility, and without building. In this paper, we suggested that IEEE 802.11p
should be implemented for fleet management, at least for the first version.
Furthermore, we proposed an analytical model for machines to estimate the
ad-hoc network performance, i.e., the delay and the packet loss probability in
real-time based on the simulation results we made in ns3. The model of this
paper can be further used for determining when shall ad-hoc or cellular network
be used in the corresponding scenarios.
