I was driving through town early one morning and collided with a roadworks sign that someone had thrown into the road. It caused £850-worth of damage to my car. Shouldn’t these signs be fastened down? When I spoke to the company concerned they just said it was vandalism and there was nothing they could do about it.
The company is obviously aware that its property is being vandalised and could present a danger to road users. So a court might think that it should have taken reasonable precautions to prevent the vandalism, perhaps by securing the signs into blocks of concrete. If you have legal expenses insurance with your motor policy you could ask them to pursue this line of approach. It will help if you reported the accident and took photographs. Your driving will come into question too.