Final answer:
Roadside assistance is the service to call if you have a breakdown and are within 50 miles of the location, provided you are a member of an auto club like AAA. If this isn't an option, then a towing service should be contacted.
Step-by-step explanation:
If no substitute is found within 50 miles of the breakdown, the organization to call would typically be roadside assistance. This service is often provided as a benefit to members of auto clubs such as the American Automobile Association (AAA). As noted in membership benefits, in order to receive roadside assistance, one must be a dues-paying member of the organization in good standing, which makes roadside assistance a material incentive. It is exclusive to those who have supported the organization through membership. In the event that roadside assistance is not available or one is not a member of such an organization, contacting a towing service directly would be the next best option.