It comes from the Metro-DOT info. Ever see those diamonds carved into the freeway? It measures vehicle speed and reports back. The only question is how often Google updates the info.Does anyone know how accurate the Google traffic report is on the maps ? Where does that info come from ?
There are the big white paint diamonds which mean HOV lane, then there are the diamond-shaped cuts in the pavement. Those hide the sensors. (You also see them at traffic-controlled intersection signals.) They aren't painted, they're just cut-then-patched bits of pavement, where the cuts have been made in (usually) a diamond shape.I always thought those diamonds meant "HOV lane."