Thick fog caused 140 road accidents across Dubai on Sunday, according to Dubai Police.
Traffic also was far more congested than usual.
Director of the Dubai Command and Control Centre Brigadier Omar Abdul Aziz Al Shamsi said in a statement there were 900 phone calls to police relating to fog-covered roads between 3am and 9am.
Al Shamsi said police used flashing lights to warn motorists of accidents, rather than blocking entire lanes in an effort to reduce the impact on traffic flow.
He urged motorists to check their cars lights and windshield wipers were working properly before driving and to drive carefully by slowing down and keeping a safe distance behind other vehicles.