Petrol-electric hybrid cabs are gaining popularity among taxi operators. SMRT, the third largest cab company here said on Monday that it will add more than 600 Toyota Prius hybrids to its fleet over the next one year. The first cars will arrive on Friday.

The move will make SMRT the largest hybrid taxi operator in Singapore. They will make up about one-fifth of its total fleet of some 3,500 cabs, which are predominantly diesel.

Taxi firms with petrol-electric hybrids include Premier and Prime taxis.

SMRT senior vice-president (roads) said: "Opting for hybrid vehicles is a conscious move on SMRT's part in generating more positive environmental footprint on roads." He said passengers can look forward to more comfortable, smoother and quieter rides with the new taxis.