Uber and Lyft have changed the taxi industry in many ways. The most obvious: supplanting the old-school meter that calculated distance by monitoring wheel rotations with a supposedly more accurate GPS meter. Measuring distance traveled and time spent in car, each company has its own method to determine how much your ride to Zeitgeist or the county jail should cost. There's just one problem: Lyft's fare-calculator has still yet to be approved by California regulators. That is to say, officials are not convinced that fares are being accurately determined.

And this is not just a regulators-versus-industry thing, reports the Chronicle, as both Uber and Flywheel have had their apps approved for accurately calculating fares (Flywheel received final approval and Uber a temporary one).

So what's going on? The paper notes that Lyft submitted its app to the California Division of Measurement Standards in December of 2014, and fifteen months later has still not been given the go-ahead.

“All we can say at the moment is that (the division) continues working with Lyft to evaluate the app it uses to determine fares,” Steve Lyle of the California Department of Food and Agriculture (which somewhat confusingly overseas measurement) told the Chronicle.

Standards dictate that the GPS meters not overestimate distance by more than one percent or underestimate by more than four percent, and the paper postulates that Lyft's app is having trouble measuring distance accurately when in dense urban areas — you know, like the Financial District. Lyft spokesperson Chelsea Wilson reached out to SFist and informed us that the company is "currently going through the approval process and actively engaged with the CDFA," but did not specify as to why the process is taking longer than it took with Uber or Flywheel.*

So does that mean you're being overcharged? Or maybe undercharged? Well, like with so many things in the opaque world of industry-disrupting startups, there's really no way to know for sure. Yet.

*This post has been updated to include a statement from Lyft.

Related: Lyft: You'll Be Hailing Our Self-Driving Cars In Ten Years