Motorists were stuck in long queues on the A158 Wragby Road after a fallen tree hit a car and blocked the road near the junction with Scothern Lane.
The tree fell at around 3.30pm and smashed the front and back windows of a black Mercedes, also denting the roof.
The four occupants of the car were uninjured.
Police were on scene to direct traffic through one lane, causing delays in both directions throughout the afternoon.
The Highways team are clearing the tree.