Moderator: Site Management Team
I can understand the numbers to the left as thats vehicle count, its the numbers along the bottom that confound me. I had wild theories to "oh the hour" of the day to "ahh must mean for that year" and that we are 4yrs late to get freedom of information reports. However, if was years, why sudden spikes or sudden dips in traffic and if hours, I cant fathom 10k cars more more at 2am in a place I know to be fairly quiet at that time.
The traffic in a year on any section is quite variable depending upon, for instance, the state of the economy or the presence of any roadworks on the section concerned or adjacent (esp noticeable around Birmingham box).
I'm not sure where you are looking and seeing the dips and spikes, but I know that up here in the Highlands, they are related to major construction projects (Beauly - Denny Power Line; Hydro schemes, etc), and also variations in tourist traffic year by year. I believe that much of the raw data is collected in March, and it could be that the movement of Easter has an effect as well. Whilst I'm not aware of any major construction projects around Weston (Hinkley C is probably too recent for the data), the tourism effect may play a significant part in the variations.
(I see Richard has made similar comments!)
My mission is to travel every road and visit every town, village and hamlet in the British Isles.
I don't like thinking about how badly I am doing.