Yes, they are cheap. But Shanghai buses are often overcrowded and overhot. They are also slow, and Shanghaiist is already habitually late. Now we have another excuse for not getting on the bus — they keep bursting into flames. Thursday afternoon, an hour before rush hour, a No. 920 bus caught fire on Huaihai Zhong Lu, one of the city’s busiest streets, near Sinan Lu. Flames engulfed the bus, destroying it and stopping traffic for more than 30 minutes. Amazingly, there were no reported injuries. The cause of the fire is still under investigation. This was the second bus fire in Shanghai is less than a week. On Saturday, a No. 715 bus caught fire at the intersection of Xizang Nan Lu and Fangxie Lu in Huangpu District. Again, no injuries were reported.