Final answer:
The total width of a T-Route on either side of the centerline was originally 5 diameters according to an older rule of thumb but is now suggested to be as much as 8 diameters for safety and practical considerations.
Step-by-step explanation:
The question pertains to the total width of a T-Route on either side of the centerline. According to older guidelines, a rule of thumb for the width of a T-Route on either side of the centerline was 5 diameters side-to-side and 7-8 diameters deep. However, more recent investigations suggest that a safer dimension would be as much as 8 diameters side-to-side and 15 diameters deep. It's important to remember that the width and depth of such a route may vary due to multiple factors, including the specific application and safety requirements.