BUS captains will no longer need to have their temperature taken before starting their shift now that Singapore is lowering its alert level from orange to yellow.

SBS Transit, which runs most of the buses here, however said that it will still continue to disinfect its buses and trains as a precautionary measure.

SMRT said it will also continue to with its stepped up cleaning and disinfecting of premises, common areas, trains and buses.

In addition, the ventilation of trains, buses and taxis will be improved.

On Wednesday, leaders from the National Transport Workers' Union include its acting executive secretary Ong Ye Kung who were on a regular a visit to Clementi Bus Interchange were shown what precautionary measures were in place should the flu situation take a turn for the worse.

Besides temperature taking, hospital-grade soap was being used in interchange toilets as well as disposable cutlery in the canteen.

An isolation area has also been set up in the bus captain's lounge should any bus captain have a high temperature and have visited an affected country.

Bus operations will also be segregated should the need arise but bus frequencies should not be affected, said SBS Transit's executive director Gan Juay Kiat.

SMRT has also said that it can be divided into contingency teams and frontline staff will be required to wear facial masks if the alert is raised.

They may also have to reduce their service by no more than 30 per cent if the red alert is raised due to a reduction in manpower.