Twenty roads across the country unsuitable for HGVs have been identified as dangerous because sat-navs continue to direct trucks to use them.
According to the Liberal Democrats, sat-navs frequently direct HGVs down narrow roads from Leeds to Lewes, West Sussex, where they can become stuck or hit low bridges.
The Lib Dems are asking the government to take action to ensure sat-navs take into account the width and height of vehicles before identifyinga route.
The Lib Dem's shadow transport secretary, Norman Baker, says: "The government promised to look at this problem over two years ago, but it has completely failed to act."
Baker believes that an increase in the use of sat-nav systems has led to a doubling of the number of large vehicles hitting rail bridges, with Network Rail reporting 2,000 strikes a year, which is equivalent to five a day.
See our full list of the dangerous roads.