Service Quality for Taxis

Drive a taxi? How can you measure the quality of your service?
Lets see this example from Singapore:
First: Don’t get in accidents. The standard is not more than two accidents for every 10 million kilometers traveled.
Second: Answer your phone. In Singapore, cab companies are required to answer 90% of their calls, including a confirmation of availability in less than five minutes.
If these standards are not met, taxi cab companies are fined.
However no word about sticky floors and cardboard pine scents.
(From Channel NewsAsia)