There is a way that you can cut through from the N3 down through Summerhill and come out on the Mullingar bypass, or you can go the old N4 to Kilcock, then Summerhill.
However, they'd only be quicker if the M/N4 is completely fooked and there's a good chance a lot of Westmeath bogball supporters will know the route. And it still wouldn't get you out of Dublin any quicker.
I did the Liexlip to Mullingar via Summerhill a few weeks ago when a crash between Enfield and Clonard had it tailed back to the start of the motorway - still took 2.5 hours....
Other way could be the N3 to Cavan and then cut across, but you'd struggle to do that in 2 hours.
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