Elise, an emergency medical technician, renders aid to a participant in Forest Trail Marathon, an athletic event. Regarding a suit by the participant against Elise for negligence, Elise is immune from liability under

Good Samaritan Statute

Explanation:

Good Samaritan statute offers legal protection to an individual or a group or people who give assistance to someone else who they believe is injured, ill, incapacitated or in possible perilThis law was put in place to protect bystanders that want to help a person that is injured. They will not be held liable in case of wrongful death or unintentional injurySo the suit against Elise for negligence by the Forest Trail Marathon participant is not enforceable as she is immune from liability under the good samaritan statuteFor someone to be liable for failing to offer assistance to someone they consider injured, ill, etc, they must have "duty to rescue". Some states require individuals to notify if they see someone who is in peril, or hurt, etc, but thy are not required to act (their have duty to rescue is limited to the notification)

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it