The Skyway Bridge has closed twice this week during morning rush hour because of heavy sea fog.

On Tuesday morning, the Florida Highway Patrol closed the bridge at 5:30 a.m. for about 8 hours. The department had to close the bridge again on Thursday morning from 5 a.m. to 11:30 a.m.

It's no surprise drivers have been frustrated during morning rush hour as the Skyway is the only bridge connecting Manatee and Pinellas counties.

The Florida Highway Patrol told 10News WTSP it does not take the closure lightly, calling it a "massive project" with "lots of manpower." Two troopers have to be pulled in to shut down both the Manatee and Pinellas County sides and to clear out the rest areas. Even more, thousands of dollars is lost in revenue from the two toll plazas.

So, what are the conditions for the Skyway to close? According to FHP, there has to be sustained high winds of 40 mph or fog that limits visibility to less than 100 feet.

Unfortunately, there is no chance FHP will keep it open and hope drivers take it slow.

The reason? With visibility so low, there is a higher chance of an accident and the possibility of a car falling 200 feet into the Bay.