Pico y placa is a driving restriction policy aimed to mitigate traffic congestion. The scheme was initially set in place in Bogotá, Colombia in 1998 by then mayor Enrique Peñalosa to help regulate traffic during rush hours. The system restricts traffic access into a pre-established urban area for vehicles with license plate numbers ending in certain digits on pre-established days and during certain hours. Initially, the system restricted traffic between 6 and 9 am and between 5 and 8 pm Monday through Friday.