Under Article 82 of the Road Traffic Safety Law Implementation Regulations, under what circumstances may a commercial passenger bus drive or stop in the expressway emergency lane (应急车道)?

1. Only when the vehicle suffers an emergency breakdown, tire failure, or passenger medical crisis that makes continued driving impossible
2. Whenever traffic is congested in the regular travel lanes to keep the bus schedule on time
3. To allow passengers to disembark for personal biological needs or sightseeing
4. Whenever the driver needs to inspect mobile phone navigation messages