According to Article 78 of the Regulations for the Implementation of the Road Traffic Safety Law of the PRC, what is the maximum statutory speed limit for large passenger buses (大型客车) operating on expressways under normal weather conditions?

1. 100 km/h (whereas small passenger cars may travel up to 120 km/h)
2. 120 km/h (identical to small passenger cars)
3. 80 km/h on all expressway lanes
4. 130 km/h on three-lane expressways