Final answer:
The NHTSA's Technical Assistance Program Assessment Standards include a required system access through a 9-1-1 emergency phone number.
Step-by-step explanation:
The National Highway Traffic Safety Administration (NHTSA) provides a set of recommended standards for EMS systems called the Technical Assistance Program Assessment Standards. One of these standards is required system access through a 9-1-1 emergency phone number. This means that EMS systems should have a system in place that allows individuals to reach emergency services by dialing 9-1-1. This is an essential standard to ensure that emergency assistance can be quickly and easily accessed by the public.