The city's eastern boundary is Highway 1, a four-lane, divided superhighway that travels from Baghdad past Fallujah towards the west. After the sanctions imposed by the UN after the 1991 Gulf War, this highway became the main supply route for the country. Truckers and travelers from Saudi Arabia, Jordan and southern Syria all merge onto this highway prior to entering the Eastern Al Anbar province. The highway has a prominent 'cloverleaf' interchange with Highway 10 on the eastern edge of Fallujah. Highway 10, which also runs through Fallujah. It is a two-lane highway that turns into a four lane highway once inside of Fallujah. The highway runs east-west from Baghdad through Fallujah then west towards Ramadi. A 'cloverleaf' on-ramp allows for traffic on/off Highway 1. The highway basically splits the city into two halves, north and south.