Colorado DOT (CDOT) has implemented ramp metering to regulate the flow of traffic onto freeways as part of the T-REX (Transportation Expansion) project. Each ramp meter site costs approximately $50,000 which includes the cost of the controller and approximately 15% mark-up for design. The cost does not include cost of communication infrastructure to the installation.

The cost is assumed to be in the same year dollars as the date the cost data was made available.