Sir, - It now appears that Dublin will not have a proper public transport system for the next 10 years. So, in the meantime, by way of easing the present chaotic grid-lock, why don't Dublin Bus lease an extra 500 buses, double their frequency and run their service free-of-charge?Not only will this clear the gridlock, it may also prove to be more cost effective than forking out over £400 million on a system that nobody seems sure is either doable or workable. - Yours, etc., John Devlin,Erne Terrace, Baile Atha Cliath 2.