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Sec. 141 of M-39 is the source
141 Minor Adjustments
141.111 The routes must be maintained in reasonable adjustment throughout the year. In order to fulfill this requirement, local managers may find it necessary to make minor route adjustments, to provide relief, add deliveries, capture undertime, etc.
141.112 When considering if a mail count and route inspection is necessary, review the nature and scope of the adjustments needed. If the review discloses that only minor adjustments are necessary, the adjustments should be made from current management records and information.
141.13 Street Management
141.133 Deadheading and unnecessary retracing should be eliminated. Lines of travel as indicated by the case layout must be followed by the carrier. Unauthorized deviations generate customer complaints, waste both time and energy, and conflict with the order which the letters are placed in under Delivery Point Sequencing. When it is determined that more efficient travel patterns are possible, management should arrange for the appropriate changes in the sort plan, case labels and advise the carrier of the new line of travel.
141.19 Formula for Making Minor Adjustments. A simple formula for making minor adjustments, without mail counts and inspection, may be made in the following manner if the previous count and inspection data is reasonably current and the same carrier is serving the route being considered:
a. Determining Office Time. Using the most recent Form 1840, review the net and standard office time and select the lesser of the two. If the net office time is used, deduct the actual times used on Line 14,15, 16, 19, and 21, the 5 minute standard for Line 20 and the office break. If the standard office time is used, deduct the standard time allowance for
Line items 14, 15, 19, 20, and 21 (use actual times if they exceed the standard times) and the actual time used for Line 16 and the office break. Divide the remainder by the number of possible deliveries.
An example would be the total of the Lines items equals 30 minutes; Net office time is 3:10 minutes, and there are 530 deliveries. Subtract 30 from 3 hrs 10 mins and convert to minutes (160 mins) then divide the total deliveries by the total minutes (160 ÷ 530 = .30 minutes of office time-per possible delivery.
b. Determining Street Time. Using the most recent Form 3999, deduct the vehicle loading time, travel time to and from route, time spent collecting from collection boxes, time spent for relays, gassing vehicle, vehicle moves, replenishing mail after loop, breaks and comfort stop time. Divide the remainder by the number of possible deliveries to determine the street time used per delivery.
Possible deliveries 530 -- Street time for Form 3999 - 5:15
Total minutes extracted is 52 minutes which equates to 263 total minutes (315 min minus 52 min). Then divide 263 min by 530 deliveries = .50 min of street time per possible delivery.
c. Determining Time Per Delivery. Add average office and street time to determine time per delivery. In this case it would be: .30 + .50 = .80 time per delivery.
d. Determining Possible Deliveries. To determine the number of possible deliveries to be removed or added, divide the time being considered for removal or addition by the time per delivery.
25 ÷ .80 = 31.1 or 31 possible deliveries.
e. Computing Route Total Time. Add to or subtract from route involved:
Route 3671 8:25 - :25 = 8:00.