I think what is implied is that it is durable and can last harsh road conditions, so although the suspension works overtime to keep the car nice and smooth it won't wear out that easily.
I am sure you know you brought alive a 7 year old thread..but since you did ask a reasonable question I guess it would be okay.
Hope these will help. To my knowledge, a brand/model breakdown is not available in the public domain.
http://www.motortraffic.gov.lk/web/web/index.php?option=com_content&view=article&id=84&Itemid=115&lang=en
http://www.transport.gov.lk/web/index.php?option=com_content&view=article&id=255&Itemid=&lang=ta