TfL has also built a £25 million cable car across the River Thames, the Emirates Air Line, to link 2012 Olympics venues. It was inaugurated in June 2012 and crosses the Thames between Greenwich Peninsula and the Royal Docks, carrying up to 2,500 passengers an hour at a heights above in the air. It is designed to cut journey times between the O2 arena and the ExCel exhibition centre – both of which are Olympic locations. The system could provide a crossing every 30 seconds.