(6)Notwithstanding anything contained in sub-section (4), where housing or other activities are an integral part of the highway project and the profits of which are computed on such basis and manner as may be prescribed, such profit shall not be liable to tax where the profit has been transferred to a special reserve account and the same is actually utilised for the highway project excluding housing and other activities before the expiry of three years following the year in which such amount was transferred to the reserve account; and the amount remaining unutilised shall be chargeable to tax as income of the year in which such transfer to reserve account took place.
