Ian/Steve.
What you are witnessing is the mass EXODUS from Llandudno at 4pm, they wend there way slowly to the A55 by 5pm.
Below is a picture on Llandudno Pier at 5pm tonight....
Please don't say the weather closed in and caused it, it was like this in blistering heat at 4pm!
You will note that ALL shops were closed, but all were open until they lost the will to live, circa 4.30pm