A sign warning of a high pressure petroleum pipeline is seen on the "Line 9" Enbridge oil pipeline route in East Don Parkland in Toronto, March 6, 2014. The National Energy Board is set to make a decision on whether to allow Enbridge to reverse the flow of and increase the capacity of oil in a pipeline between southern Ontario to Montreal that has in operation for years. REUTERS/Mark Blinch (CANADA - Tags: POLITICS ENERGY)