Public transport operator SBS Transit will roll out nine more wheelchair-accessible (WAB) bus services on Sunday, March 31.

The nine services are: 4, 50, 62, 82, 116, 119, 132, 158 and 513 .

These services will bring the total number of wheelchair-accessible routes operated by SBS Transit to 148.

Currently, about 73 per cent of its basic bus services are wheelchair-accessible.

According to SBS Transit, there are approximately 3,900 trips made by wheelchair passengers on average each month.

As of December last year, it had 2,052 buses that are wheelchair friendly in its fleet of about 3,000 buses.

By 2015, close to 90 per cent of the operator's fleet will be wheelchair-accessible.

Mr Edmund Wan, president of the Handicaps Welfare Association (HWA), said: "The HWA applaud the efforts by SBS in gradually moving to have all their buses accessible for wheelchair users to move around. Members of our association have always advocated an affordable transport and buses are the cheapest means that answer their call."