There’s a curious intersection outside the local high school in La Crescenta, California. It’s not curious because of its design—nothing fancy, just an unassuming street where kids walk to class, neighbors cross with coffee, and cars glide by with variable awareness. It’s curious because of what it doesn’t have: a stop sign. Now, you might think: surely, if a stop sign is needed, someone just installs it. But the tale, like so many in our modern civic life, is stranger than fiction and more t...