Final answer:
Communication between a motor carrier and the shipper is typically best practiced before every shipment and after every shipment to confirm details and address any concerns. Regular proactive communication helps in resolving issues and maintaining a strong professional relationship.
Step-by-step explanation:
The frequency of communication between a motor carrier and the shipper can vary depending on the specific needs and agreements between the two parties. However, it is generally best practice for the motor carrier to communicate with the shipper before every shipment to confirm details such as shipment contents, expected pick-up and delivery times, and to address any special requirements. Moreover, after every shipment, it would also be advisable to follow up to confirm that the delivery has been completed satisfactorily and to document any issues that may have arisen. While it is not necessary to communicate on a quarterly basis solely for the sake of regular check-ins, maintaining an open line of communication can be critical to quickly resolving any issues that arise and to fostering a strong working relationship.