There are a number of mashup sites on the Web, but my favourite at the moment is RegionalTraffic.co.uk. It’s not that useful to me at the moment, as I’m based in the Isle of Man and we don’t really have congestion problems here, but I like what Regional Traffic have done with their website.
My favourite feature? Well, traffic reports and route mapping now seem to be a standard with these type of websites, but where this site really stands out is that it also reports availability of car parks in the area you’re looking at and how many spaces are available! I’ve only seen this information around the Norwich area, but I’m sure other areas will follow. Check it out.