My accident was caused by a dangerous roadway situation such as uneven or broken road or pavement surface, loose drainage cover ot pothole) Could I still have a case?

If the conditions were due to someone’s negligence you may have a case. If the defect was of a natural cause such as weathering or normal use, you will likely need to prove that the responsible party for the defect was aware of the defect or should have known within reason of the defect and that the party had ample time to correct it.