Steep climb give an increased risk of fire

Steep climb give an increased risk of fire
Heavy vehicles are overrepresented in the statistics of fire in Norwegian road tunnels, and this is especially true for tunnels with a steep climb. Technical problems was a more than twice as frequent cause of fires and instances of fires in heavy vehicles, than in light vehicles says the Institute of transport economics, Norwegian Centre of Transport Research. 40% of the fires in tunnels happens in tunnels with higher gradient than 5%.
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