Where ramps are currently expected to accommodate metering, or expected to in the future, the geometric design features referred to in design criteria for ramp metering should be considered. Ramp metering, when properly designed and installed, has been shown to have benefits for the operation of the mainlanes. However, since ramp meters are installed to control the number of vehicles that are allowed to enter the mainlanes, an analysis of the entire roadway network area should be done to determine adverse operational impacts to other roadways. It is suggested that the analysis specifically include both frontage road and adjacent cross street operations of through traffic, turning movements, and queue lengths. Refer to for additional discussion and design details on ramp metering.