http://www.straitstimes.com/forum/letters-on-the-web/why-peak-hour-charge-at-popular-carparks
http://www.straitstimes.com/forum/letters-in-print/differential-pricing-to-better-manage-parking-demand
http://www.hdb.gov.sg/cs/infoweb/car-parks/short-term-parking/short-term-parking-charges
Take note of the extra charges of these HDB car parks..