So let's cut to the chase, how do I do this? In a nutshell: Create a new twitter account; link that to a twitterfeed.com account (a service that turns RSS feeds into twitter posts) and an RSS feed; then follow in your normal twitter account the new twitter account just created and, if you want text alerts of the data (e.g. when you're actually travelling round the area), turn on device updates for the following of the new account (assuming you've already registered a mobile device for this purpose in your main account).
Then you get new tweets and or text alerts each time there's a new RSS entry in the source feed.
If you want to subscribe to the results for that feed simply skip all the setup above and just follow NWUKTrafficAlrt in your twitter account.