Over the years, Caltrans has implemented ramp and freeway connector metering as an effective traffic management strategy. Ramp meters operate most effectively when upstream mainline traffic is controlled. This control has been accomplished in District 7 by metering on-ramp to freeways and metering freeway-to-freeway connectors. The primary objective of metering is to reduce congestion and the overall travel time of motorists on the freeway. Other benefits include increasing motorist safety by reducing congestion-related accidents and air pollution caused by vehicle emissions.