Using more than a billion miles of driving behaviour data, collected over three years (2011-2014), Wunelli, a LexisNexis company, has revealed the most frequent braking black spots across the UK created by speed cameras, based on motorists braking excessively just before speed cameras to avoid being caught. 80 per cent of all the UK speed cameras investigated had hard braking activity, with braking increasing six fold on average at these locations. Wunelli defines a hard braking event as a change in speed of 6.5+ mph over a one second time period, which is enough to propel a bag on the passenger seat into the footwell.