But what is the point of rolling through at 3mph? To save 2 seconds? The reality is people roll stops because they are a bit lazy, and stopping fully requires m

But what is the point of rolling through at 3mph? To save 2 seconds? The reality is people roll stops because they are a bit lazy, and stopping fully requires marginally more effort. And while that laziness is harmless at empty intersections, it invariably turns into complacency and habit that bleeds into situations that aren't as safe. The same dynamic happens with signaling lane changes.