E-470 toll revenues rose 14 percent to $107.7 million last year, officials said.Traffic grew for the third straight year in 2011 to 52.1 million toll transactions from 51.3 million transactions in 2010, according to the E-470 Public Highway Authority. It was the second-highest traffic level next to a 54.1 million toll transactions in 2007.Officials attributed the $13.4 million jump in 2011 revenue to growing traffic, combined with a 2011 increase in the toll charged to motorists who are billed by their license plate. Motorists tracked by transponder devices pay a lower toll.E-470 was also able to save 7 percent, or almost $2 million, in operating costs last year, officials said.E-470 Finance Director Joe Donahue said the growth in toll revenues was enough to meet E-470s financial obligations, which included a $65.2 million debt service payment to bondholders. E-470 has $1.5 billion in outstanding bond debt.Donahue said the rise in revenues also boosted the authority's capital construction fund, helping pay for other roadway resurfacing and safety improvements. This included covering the $14.5 million cost of a 2012 project to reconstruct 2.5 miles of the oldest section of E-470, which opened in 1991.The E-470 toll road runs along the eastern perimeter of the Denver metropolitan area. The road is financed, constructed, operated and governed by the E-470 authority, which is comprised of eight local governments: Adams, Arapahoe and Douglas counties, and the municipalities of Aurora, Brighton, Commerce City, Parker and Thornton.