The inquest into the M5 crash in which seven people died, has heard that smoke from a nearby fireworks display did not drift over the motorway.
Display organiser Geoffrey Counsell said he was standing between the fireworks display and the carriageway and was worried visibility would be reduced for spectators as the smoke was drifting towards them.
The hearing continues.
An explosives expert tells an inquest he has been unable to find any literature warning of the dangers of smoke from fireworks to drivers.
Drivers have told an inquest of their horror at being involved in one of the worst British motorway pile-ups in living memory.
Witnesses have been describing the driving conditions at the inquest into the deaths of seven people who died after a pile-up on the M5.