"At a four-way stop, the driver reaching the intersection first may proceedbefore the other drivers (after coming to a complete stop). "  - this one is from the book you quoted."If four cars arrive at a four-way stop simultaneously, drivers going straight should proceed first. If all four are turning right, they may all proceed simultaneously. These aside, there is no distinguishable way to see who should go first, so the intersection is at a standstill until one driver gets up the nerve and begins to inch forward, alerting the other drivers of his or her intentions, and proceeds through the intersection (thus starting the clockwise rotation from that driver)." - this one is from my link above.