Once again, the A55 has been closed due to flooding, and this is after £3,000,000 of work was carried out to prevent flooding back in 2013. From what I've seen myself, the work consisted of relaying a French drain along the side of the road - how anyone could think that would be able to cope with the massive volumes of water seen draining off the fields during heavy rain is beyond me? If you study the topography of the land at that point, the answer is straightforward - build large ditches on either side of the road that drain the floodwater straight into the Ogwen river that is only several hundred feet away in the Bangor direction.
Photo courtesy of Gerallt Jones.