How very sad. My sympathy to the riders' family, and to the driver, who must be pretty shocked.
Don't know if there was a gate at the end of the bridleway, but there are times, when they are a godsend when riding an excited horse.
Have sent you a message Gumpy.
Galaxy - I saw the friend you spoke to at lunchtime - she was given the facts then so probably wasn't so informed when she called you earlier. Easily done x