The answer to your question is given under Answer 104 of CBDT Circular No 8/2005 dated 29/8/2005 which is given as under
Whether expenditure incurred by the employer for the purposes of providing free or subsidized transport for journeys to employees from their residence to the place of work or such place of work to the place of residence would attract FBT ?104. The free or subsidized transport provided to employees for journeys from their residence to the place of work or such place of work to the place of residence is in lieu of conveyance/transportation allowance, which is not liable to FBT. Accordingly, the expenditure incurred by the employer for the purposes of providing free or subsidized transport for journeys to employees from their residence to the place of work or such place of work to the place of residence will not be liable to FBT.