If you can do so safely, you may pass on the left at an intersection if:

Option 4, "The vehicle ahead is signaling a right turn," is the correct answer. The importance of this regulation lies in ensuring smooth traffic flow and preventing congestion. When the vehicle ahead is preparing to turn right, it may need to slow down or even stop before turning to wait for a safe opportunity to proceed. In this situation, if the following vehicle can safely pass on the left, it can effectively avoid traffic congestion caused by the right-turning vehicle. This action also increases road efficiency and reduces the risk of potential traffic accidents.