The QE2 Bridge at the Dartford Crossing and the A249 Sheppey Crossing are likely to remain closed through the afternoon due to the strong winds.
60mph winds prompted the closure of both bridges for the safety of drivers.
Traffic for the QE2 bridge is being diverted via the east tunnel. Traffic heading northbound will only be able to use the west tunnel.
A clearly signed diversion is in place for the A249 Sheppey Crossing using the Kingsferry bridge.
The bridges will remain closed until the wind speeds drop, which could be after 5pm.
Drivers are advised to plan their journeys and allow extra time.
It's been the scene of one of the worst pile-ups ever seen. And last summer, a mother and her young son were killed in a car crash on the Sheppey Crossing. Since then there has been a long campaign to lower speed limits on the bridge and today that finally happened. But people who live on the Isle of Sheppey say it's still not enough. This report by Tom Savvides includes interviews with Emma Tweed, councillor Ken Pugh and Gordon Henderson MP.
A 50mph speed limit has been introduced on the A249 Sheppey Crossing in Kent.
It follows a serious crash last July in which a mother and her eight year-old son were killed.
The coroner investigating asked Highways England to consider urgent safety measures on the bridge, which is the main link between the M2 at Stockbury and Sheerness.
In September 2013, sixty people were injured after more than 120 cars crashed. More than thirty thousand drivers use the crossing every day.
Compensation can be claimed by those involved in a crash on the Sheppey Crossing, despite no prosecutions being made, according to one of Kent's solicitors.
Around 150 vehicles were involved in the pile up on the bridge last September.
Police are offering driver alertness courses to 32 motorists who were involved.