This issue brief reviews the US-36 Express Lane Project, which involves the widening and reconstruction of US-36 between Federal Boulevard in Denver and Table Mesa Drive in Boulder. In the 1950s, this section of the highway opened as a four-lane toll road as an alternative to driving through Longmont or Golden to get between Denver and Boulder. At that time, it cost 25 cents for cars and 50 cents for trucks to travel the length of the road. The tolls were discontinued in 1968 after bonds were paid off. Today, this section of US-36 carries approximately 80,000 to 100,000 cars daily.