Traffic congestion in cities across the UK has become “far worse” over the past year, according to research by TomTom. The latest TomTom Traffic Index for the UK shows average vehicle speeds in 2013 were 27% slower than it says would be ‘normal’ conditions – up from a 26% delay in 2012. Traffic jams in 10 out of Britain’s 17 biggest cities have got worse over the past 12…