Singapore charges between S$0.25 and S$10 (HK$1.40 to HK$56) per road Monday to Saturday from 7am to 10.30pm. Rates change every 20 minutes. London charges GBP8 (HK$125) to enter the city centre between 7am and 6pm on weekdays and 6pm to 7am at weekends and holidays. Discounts are offered to some categories of driver. Stockholm levies between 10 and 60 krona (HK$13 to HK$78) on vehicles using roads in the congestion zone between 6.30am and 6.30pm. There is no charge at night, during weekends and public holidays or in July. Dubai charges between 4 dirham and 24 dirham (HK$8.50 to HK$51) when drivers pass toll gates at the entrance to the emirate's congestion charging zone. New York has proposed levying congestion charges of between US$7 and US$21 on vehicles entering the Manhattan business district from 6am to 6pm.