At 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 t

At 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?