it would be non-sensical to increase motor tax without first improving public transport.
i currently like in Dublin 15 and commute to work in the airport circa 15min drive.

if i was to get public transport i`d have to get at least 2 buses via dublin city or a train and then metro north... oh wait ....... :dodgy:

public transport is just not a viable option for a lot of people so to increase taxes to encourage use of public transport would be the wrong way to go.