SARASOTA COUNTY — Discounted road impact fees on new residential and commercial buildings will remain the same for the next two years — instead of a proposed six-month extension — after a 3-2 vote by the Sarasota County Commission on Wednesday.

The impact fees, which are based on highway capacity, or the number of vehicles on the road, are applied to the construction of new buildings in the county. They are based on 2006 building rates that were determined in the construction boom — when prices were much higher than current levels — and help pay for road improvement projects. They were reduced by 50 percent in January 2011. The fees were set at 68 percent of what was recommended by a consultant in 2007. When the county made the 50 percent reduction, the fees dropped to a third of the recommended rate.