I'm not sure about Maps to be honest, but that sort of glitch is a strong indicator that they're just snapping to the nearest current road rather than doing pro

I'm not sure about Maps to be honest, but that sort of glitch is a strong indicator that they're just snapping to the nearest current road rather than doing proper routing calculations. My Toyota has a speed limit symbol on the dashboard which will occasionally show the speed of a slip-road going onto the motorway I'm already on. I'm guessing it's a similar phenomenon.