Under Article 52 of the Road Traffic Safety Law Implementation Regulations, when approaching an intersection without traffic lights or traffic signs, which vehicle has the right of way?

1. The vehicle approaching from the right side has right of way (让右方道路来车先行)
2. The vehicle traveling at higher speed has right of way
3. The heavier three-wheeled vehicle always has right of way over two-wheelers
4. The vehicle approaching from the left side has right of way