The Unified Vehicular Volume Reduction Program (UVVRP), commonly called number coding or color coding, is a road space rationing program in the Philippines that aims to reduce traffic congestion, in particular during peak hours, by restricting the use of major public roads by certain types of vehicles based on the final digit on their license plates.
The Unified Vehicular Volume Reduction Program was the culmination of two plans devised in the mid-1990s to help resolve the issue of heavy traffic congestion in Metro Manila, which by then was the subject of many complaints among motorists by restricting the number of vehicles on the road.
The original UVVRP was conceived by Col. Romeo Maganto, who served as the executive director of the Metropolitan Manila Development Authority's traffic management office.
[1] First implemented in October 1995 on an experimental basis to address the traffic congestion caused by the construction of the Metro Rail Transit Line 3 (MRT-3) on Epifanio de los Santos Avenue (EDSA),[2] it initially targeted public utility vehicles, later expanding to all vehicles plying EDSA, where traffic congestion in Metro Manila was at its heaviest.
Meanwhile, light trucks are prohibited from using EDSA between Magallanes, Makati and North Avenue, Quezon City, from 5:00 a.m. to 8:00 p.m. from Mondays to Fridays, excluding holidays.