U.S. Route 36 in Colorado
…88th Street in Louisville, Colorado. Phase 1 of the project, costing $497 million, opened in summer 2015. High-occupancy vehicles and buses like RTD's Flatiron Flyer travel free in the HOT lanes, while single-occupancy vehicles must pay between $1.25 to $7.60, depending on time of day, or up to $13.68 without an…