Motorists were warned not to exceed 80kph on the main motorway in Abu Dhabi early on New Year's Day after the speed limit was reduced for the second time this week due to dense fog.
The speed reduction on Sheikh Zayed Road, displayed on digital signs, came as the UAE woke to thick patches of fog covering areas inland and along the coast for the fourth consecutive day this week.
The National Centre of Meteorology issued an alert warning of fog affecting a large swathe of the country, stretching from the coast around Abu Dhabi down to Al Ain, close to the border with Oman.
Visibility was down to 100m in areas, including sections of Sheikh Zayed Road.
Abu Dhabi Police urged drivers to be cautious and avoid filming the fog on their phones.
This week, motorists in Abu Dhabi received an emergency alert by text message warning them of an 80kph restriction on Monday. The variable speed limits in bad weather were first introduced last year and have been implemented several times since, including during sandstorms.
Wednesday's fog is expected to burn off by around 10.30am, leaving a partly cloudy day with temperatures of up to 27°C on the coast and 28°C inland. There will also be light to moderate southwesterly to northwesterly winds.
Although humidity is expected to rise again on Wednesday night, according to forecasters, the fog is not predicted to return on Thursday.
The weather is expected to be sunny with a gentle breeze over the weekend, with a slight rise in temperatures, reaching 31°C on Saturday in Abu Dhabi. It will be slightly cooler in Dubai at 29°C. Temperatures are expected to fall down to around 25°C again on Monday.