The National Transportation Safety Board on Tuesday said driver error was to blame for the crash of a propane tanker that burst into flames, closing parts of interstates 465 and 69 in Indianapolis in October 2009. The massive explosion occurred after driver Ronald Tobias crashed his tanker, loaded with 9,000 gallons of propane, into an overpass support. Tobias, then 73, and three others were injured in the accident. The incident created traffic issues on the north side for several days while the overpass was examined by engineers and fixed. Police cited Tobias at the time for unsafe lane movement and driving too fast to avoid a collision.