At an unregulated intersection of equal roads, which vehicle has the right of way under the general priority rule?

1. The vehicle that is traveling at a higher speed.
2. The driver must yield right-of-way to vehicles approaching from their right (the 'Priority to the Right' rule).
3. The larger vehicle (e.g. truck or SUV) always has priority over passenger cars.
4. The vehicle turning left has priority over vehicles going straight.