There are many routes in and out of off Lower Salthill, I guess you just took the wrong one. Or I was lucky, but most people I have spoken to went the way I did and no one experienced any real delays. The traffic moved slowly but moved. The major problem with Galway is not enough Guards, and what they had must have stuck to the main archerys and Lower Salthill was maybe not seen as one.
Now the Queue in Nicos chip shop on the way Home, now that was very frustrating.