My friend told me almost all petrol stations in Singapore ran out of new parking coupons! Worse still, the petrol stations were unable to exchange the old coupons into money because they were short of cash (hey, most people pay by nets or credit cards at petrol stations!) !
So, drivers ended up unable to exchange their old coupons for money and at the same time they couldn't buy any New Coupons! It is such a big screw up!