In the past two weeks in China there have been two separate incidents of buses bursting into flames, firstly in Chengdu, then worryingly closer to home in Shenzhen (warning: links contain graphic photos). Tragically in the first instance 27 people died when they were trapped inside. There have been no official reasons given for the causes of the fires although there are a number of theories going around: Mechanical failure due to poor maintenance Air conditioning overheated in 30+ °C weather Passenger carrying flammable item / liquid Domestic terrorism (Tibetan independence groups etc.) When you combine any of these possible causes with the fact that most buses in China are usually horrendously overcrowded then you have a recipe for disaster. What makes it even…