As we built a multi-functional shared services capability with IT, HR, and Finance, over time we continued to look for other services such as facilities, purchasing, sales order management, meetings, card services, and fleet management to bring under the umbrella to deliver bottom line saving to the corporation.

FORBES: CIO-plus Series: Interview with Chris Scalet, former EVP Global Services and CIO of Merck

Meanwhile, some app makers have said that the service has been slow to get started because the TLC's rules are cumbersome, especially a section intended to mollify concerns from vendors who provide the meter and credit-card systems to the 13, 000-strong fleet.

WSJ: Cab-Hail Apps Are the Target of a Lawsuit