Commuters ride on the roof of a Jakarta state rail train at Cawang train station on January 27, 2012 in Jakarta, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

A train passes concrete balls known as “Goal Bola-bola” or goal balls intended to discourage train roof riders on January 27, 2012 in Bekasi, West Java, Indonesia. Jakarta is plagued by transport problems due to the lack of alternative public transport options – with private vehicles having priority on the road networks. The number of train passengers greatly exceeds the capacity of the rail network and roof travellers are common, despite the city's best efforts to eradicate this dangerous, and illegal, method of travel. (Photo by Ulet Ifansasti/Getty Images)