At an uncontrolled intersection, two vehicles arrive at about the same time. Which right-of-way rule should guide you?

1. The larger vehicle proceeds first because its size gives it priority at every uncontrolled intersection
2. The vehicle on the left yields to the vehicle on the right
3. The motorcycle proceeds first because smaller vehicles are always granted priority over traffic on the right
4. The vehicle that sounds its horn first gains the right-of-way even when it approaches from the left