My husband was driving down a county road with a 50 mph speed limit to stack hay with a piece of farm equipment that can go about 45 mph max, and came upon three riders on the other side of the road. They started waving their arms and he slowed down to around 35. Watched them as he passed and checked in his mirrors to make sure everything was okay. Everyone was still on and all looked calm. Within 15 mins they had tracked him down saying he had bucked their 65 year old dad off and he suffered a concussion and they would sue us for his medical bills.
What is the law as far as horses on the road? Are they considered a pedestrian? Do they have grounds to sue? We are located in WA state.