3. A 10 mile stretch of Illinois Route 9, a 2-lane highway running into Bloomington, is being considered for expansion to 4 lanes. The figure below shows the demand and cost curves for the existing 2-lane highway and the proposed 4-lane highway. Demand=MB Trip Cost Social Trip Cost ($) (2/lanes) Social Trip Cost 6.00 (4 lanes) ATC (2 AIC (4 "lanes) (anes) 4.00 LRAC = LRMC 3.60 3.00 Private trip cost m Private trip cost (2 lanes) (4 lanes) V* V2 Traffic Volume: Vehicles