Horses and highways are a volatile and dangerous mix.

Recent evidence was a tragic accident near Milton, a tiny town just north of the Massachusetts-New Hampshire border. Lincoln Geist, an elderly man driving on a rural road, hit a horse and rider. The teenage girl was thrown to the ground and suffered a fractured pelvis; the horse, named Blue, suffered severe internal injuries and was euthanized by a veterinarian at the scene. Geist briefly slowed his automobile after the collision, and then drove away without offering any assistance to the stricken horse and rider