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. This scheme affected all roads entering a 6-square-kilometre area in the Central Business District (CBD) called the "Restricted Zone" (RZ), later increased to 7.25 square kilometres in order to include areas that later became commercial in nature. The scheme was replaced in 1998 by the Electronic Road Pricing.
Read more about Singapore Area Licensing Scheme: Background, Description of The ALS, Impacts, Road Pricing Scheme (RPS) Extended, Upgrade To Electronic Road Pricing (ERP)
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