Algorithm 5 POL simulation.

Require: RSU range r, speed v, rekeying interval $T_1$, runs N Ensure: Estimated dropout probability $P_{\mathrm{drop}}$   1:$T_2\leftarrow r/v$                        ▹ Average exit time   2:$Y\leftarrow min(1/T_1,1/T_2)$   3:$\mathrm{count}\leftarrow 0$   4:for $i=1$ to N do   5:    Draw $t_{\mathrm{exit}}\sim \mathrm{Exp}\left(Y\right)$   6:    if $t_{\mathrm{exit}}<T_1$ then   7:        $\mathrm{count}+=1$   8:    end if   9:end for 10:$P_{\mathrm{drop}}\leftarrow \mathrm{count}/N$ 11:return  $P_{\mathrm{drop}}$