Generate reduced Petri net for traffic lights in intersection
[forward,backward,x0,np,nt] = tlreduced(th,tk)
This function is used to generate reduced Petri net for traffic lights in intersection. The input of this function is time green and yellow traffic lights turn on in every lanes. The result is forward incidence, backward incidence and column vector represents initial condition of Petri net. Number of lanes in intersection denoted by number of elements in both input vector.