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Don't navigation systems 'snap' to the most probable lane you are driving in based on general direction instead of your exact GPS coordinates? A good example o
by aequitas 9y ago
Don't navigation systems 'snap' to the most probable lane you are driving in based on general direction instead of your exact GPS coordinates?
A good example of this I think is when driving in tunnels, there is no GPS info there, but the navigation shows you following the (curved) road.
- jacquesm 9y agoYes, they do that, and they rarely get that wrong. Also, the better ones have inertial backup & flux gate for when GPS is unavailable. Inertial backup could also help to detect the signatures of lane changes and turns.
- saagarjha 9y agoTry driving near a place with a lot of roads that are close together, like an airport. You’ll quickly see that snapping doesn’t really work, especially if you deviate from the route the GPS is trying to take you on.
- jacquesm 9y agoI do this all the time and it works remarkably well. Amsterdam and the roads around it are pretty dense, up to 6 lanes each way in quite a few places with all kinds of flyovers and multi-lane exits.
- galdosdi 9y agoAt what speeds? I'm in NYC, similar dense road systems. At a reasonable speed, snapping still works because it knows where you came from. In stop stop stop go traffic combined with lane weaving and ramp merging I've found it is not hard to trick the gps into thinking you're on a parallel access road or unrelated ramp for a little while. It's possible your highways are newer or less congested than ours?
- ryandrake 9y agoGood nav systems will fuse whatever inputs they can get including GPS, INS, compass, etc. in order to figure out and ‘snap’ to what road you’re on. Snapping to an individual lane is still AFAIK beyond these systems’ sensors’ capability. You will need an additional input like a camera for this that looks for lane markings.