You’ve probably heard that self-driving cars are safer than their human-guided equivalents (as a general rule, at least). But what if you have a hard time wrapping your head around how that concept works in practice? Never fear: developers Mark Backler and Peter Cardwell-Gardner have posted a web game, Error-Prone, that teaches you about the perils of overcrowded roads and the virtues of autonomous vehicles. You’re supposed to take control of one of the closely-packed…