Free travel facility cause a large number of citizens gather at Metro bus station. Have a look at this picture:
This is not good for the metro bus service because such a huge crowd can damage the buses. Gov. of Punjab has already requested people for fair usage of service. Free travel service is for 1 month only but nobody knows in this 1 month, how much damage will to occur to buses.

 Free Travel service is also not a good decision from financial point of view. Opposition parties in Punjab are already saying that this is just political point scoring because elections are just 1 months away.