'GMA' Investigates: Are Taxi Meters Accurate?

How to make sure you are charged fairly for a taxi ride.
3:01 | 10/28/15

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Transcript for 'GMA' Investigates: Are Taxi Meters Accurate?
Back now with "Gma investigates." This morning taxis caught with inaccurate meters. Now when you step into a cab, how can you be sure you're not being taken for a ride? ABC's T.J. Holmes has that story for us. That is the worst. Reporter: We're with the new Jersey division of affairs who inspect taxis in New Jersey. Your meter is going to be condemned. Reporter: Two parts. First mechanical conducted by Newark police, then it's on to the meter test. Each cab starts here, goes around the track one full time and continues on again to this cone which marks one mile. If the meter charges for a pile before it reaches the cone, you're being overcharged. This cab I'm in passes. On the money. You're good to go. Reporter: But this cab, that's another story. He should be all the way up there to that cone. Yes. Reporter: The consumer if they were in this cab and that meter was running that consumer is getting hosed. Basically, yes. Reporter: The meter starts overcharging more than 500 feet before the one-mile marker so for a ten-mile ride that means you'd be overcharged by $3. Give us your medallion. Reporter: The meter gets a red condemn sticker and it's shut down until it's fixed. Are you shocked to hear it came up that short. I don't know. I'll go fix it immediately. Reporter: This cab is even further off the mark. 1,323 feet. Reporter: This time it starts overcharging more than 1300 feet before the mile marker for a ten-mile ride you'd be overcharged 9 bucks. You haven't messed with the meter, right? No. Reporter: Just how long will it take you to get it fixed. I'm going to fix it thought. Reporter: That's a lot. Meter malfunction. It happens but it's egregious. Reporter: During a week of testing they tested meters 350 times with a failure rate of almost 50%. The drivers we talked to all returned to retake the test and passed. The Newark cab association told "Gma investigates" the majority of the cabs only work at the airport and only use the city flat-rate pricing, not the meter. To make sure you're charged fairly experts say ask the driver up front for the rates. Only pay the driver and get a If you believe a taxi meter is receipt. inaccurate tell the local regulator. Well, it's hard to know from city to city, here in K.C. It's this purple decal lets you know my man Clarence's cab passed the inspection on the up and up and tinkering some programs with new technology that could get rid of the meters we're familiar with, maybe be a little more accurate but bottom line, if you don't know, think you're getting cheated just ask a few I know. questions. Keep that receipt. You didn't take that cab all the way from New York to K.C., did you because I'd love to see what that would have been. Reporter: Well, flights were expensive. S it last minute so I did what I had to do. Hey, T.J., thank you.

This transcript has been automatically generated and may not be 100% accurate.

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