The Motor Trade Association obtained data that shows the percentage of fatal crashes involving some sort of vehicle factor - often bad tyres or lights - has tripled to 15 percent since 2013.
This is at the same time as Warrant of Fitness fail rates are climbing.
The MTA represents thousands of garages - its spokesperson Greig Epps is worried the Government's new Road to Zero plan won't tackle this.
He speaks to Susie Ferguson.
