Double decker buses will fit grand. They are 4.3m high and the tunnel can cater for anything up to 4.65m. Aircoach bses are actually not that lower than double decker buses as they have the big luggage area under the passenger area.
The only thing that wont fit into the tunnel are the giant supertrucks, which were not widely used in Ireland until the tunnel was ready to be started, and the clearence height known.
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