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HOW accurate are the overhead speed indicators on freeways? We have a new Hyundai Terracan and suspect the speedo is inaccurate. When sitting on exactly 100km/h on the Geelong Freeway the overhead indicator said 95km/h. Can we assume this is correct?

THE overhead indicators are just that, indicators. They have a tolerance, which means they are not 100 per cent accurate. They can also be inaccurate if not checked regularly, so they must be taken as a guide only. The speedo reading in your Terracan fits with what I would expect: it is within the permitted accuracy of plus or minus 10 per cent. I'd suggest you make the same check against the freeway indicators to build up confidence in the readings they're giving you. If they are consistent over a couple of weeks I'd accept them as being accurate and drive accordingly.

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