[Endy]

My personal opinion is that the proper level is whatever ensures there's safety and control over both T&LC drivers and their vehicles - including limiting the number of said vehicles on the road at any one time. On the more personal level, requiring a percentage of the fleet to be ADA-compliant vehicles (i.e. wheelchair accessible), as well as a clear identification of the driver's identity and license number, are absolute necessities. If we could put speed and range limiters on the cars, I'd be even happier.