In terms of multi-path, I can well imagine that being inside a fast-moving car in a body of traffic isn't far off the worst-case scenario - not only is the rece

In terms of multi-path, I can well imagine that being inside a fast-moving car in a body of traffic isn't far off the worst-case scenario - not only is the receiver moving (unpredictably, if they're changing lanes), but there are a bunch of reflectors moving around them, also unpredictably.