I agree with Mr Laurence Ng ("Raise rebate in off-peak car scheme"; Sept 21) that at current certificate of entitlement (COE) prices, the off-peak car (OPC) rebate is far too insignificant to encourage anyone to consider the OPC scheme.

However, given the volatility of COE prices, to simply increase the rebate by a fixed amount is not practical in the long run.

Instead, the rebate should be 50 per cent of the prevailing COE price, and it should be applied on a pro-rated basis.

This will allow the rebate to remain proportional at all times, and is a fairer way to tax everyone.

I hope that the Land Transport Authority and other agencies will look into this suggestion, so that more car owners will be encouraged to switch to the OPC scheme.

Han Yongyuan