HDB, which runs 290 carparks in neighbourhood and town centres, plans to convert more of them from the coupon system to the electronic one soon.

The Electronic Parking System, which uses CashCard technology and the in-vehicle unit reader, charges by the minute.

HDB said motorists get a 10-minute grace period.

It charges by the minute at the normal parking rate of 50 cents per half hour. This is equivalent to 1.67 cents per minute.