A survey by the Dublin Transportation Office has reportedly found that the introduction of the LUAS has failed to have a significant affect on car usage.
Reports this morning say the study found that car usage in areas served by the tram system is down just 2%, compared to a 4% rise in areas not served by the system.
Bus usage in LUAS areas has almost halved in the same period, while it has increased in areas with no access to the light-rail system.
Four-fifths of people involved in the study said they believed the LUAS had made travel to the city centre easier, but 40% said it had not eased overall traffic congestion.