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Smartphone SatNavs to get centimetre-perfect GNSS receivers in 2018

Dave 126 Silver badge

Differentiating between lanes separated only by height is an issue for the map data - the GPS unit itself can give you a 3-dimensional location coordinate. If the map data is in 3D - or more likely a format derived from past traffic GPS data, eg the upper lane eventually veers East) - there's no problem.

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