The Singapore Area Licensing Scheme (ALS), (Malay : Skim Perlesenan Kawasan Singapura) introduced in 1975, charged drivers entering downtown Singapore, and thereby aimed to manage traffic demand. This was the first urban traffic congestion pricing scheme to be successfully implemented in the world.[1] This scheme affected all roads entering a 6-square-kilometer area in the Central Business District (CBD) called the "Restricted Zone" (RZ), later increased to 7.25 square kilometers in order to include areas that later became commercial in nature.

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