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23 June 2010, 09:31 | Updated: 23 June 2010, 11:22
15 engines were called to Rush Green Motors on London Road near Langley just after 5 o'clock this morning.
It's believed a number of vehicles and scrap metal have caught alight.
Police in Hertfordshire have had to close both lanes of the B656 at the junction with the A651 White Lane.
A spokesperson told us the smoke was causing visibility problems for motorists and they plan to close the road all day.