Final answer:
The message precedence assigned to all types of traffic that justify electrical transmission but are not of sufficient urgency to require a higher precedence is Normal.
Step-by-step explanation:
The message precedence assigned to all types of traffic that justify electrical transmission but are not of sufficient urgency to require a higher precedence is Normal. Normal is the default message precedence that is assigned to most types of traffic, indicating that the message is important enough to be transmitted electrically, but it does not have a higher level of urgency or priority.