If there is an overlap between the time window of gas station i and the revised time window of gas station j
corresponding to the gas station i, gas station j can be a successor gas station of gas station i, then gas station j
can be added into the set of feasible successor gas stations of gas station i, otherwise, gas station j is not allowed
to join in the set of feasible successor gas stations of gas station i.
For every gas station j in the set of the feasible successor gas stations of gas station i, we calculate its transfer
probability ij p by the following equation