Could a police officer be found negligent for turning around in the middle of a road causing two vehicles to stop short?
It does not sound like you received any damages. therefore your request would not have any merit.
A median is an area in the middle along the highway (between the two directions) that is used to separate opposing traffic and provide areas for out-of-control vehicles recovery, emergency stopping, left-turning and U-turning vehicles storage and pedestrians refuge. A median's width ranges from 1.2m to 24m. The economic factor mainly controls the median width.