There is a risk ratio known as Heinrich's Accident Pyramid which states that for every 300 unsafe acts, 29 result in minor injury, and one will result in a major injury such as death or disability.
So if you apply that to risky driving on the roads, near misses take on a new meaning, and with 80,000 visitors expected for the Rugby World Cup, that's a lot of extra people on our roads.
How much more dangerous will that make life for motorists?
Watch Natasha Utting’s report