ARMY TM 5-5420-212-10-1 MARINE CORPS TM 08676A-10/1-1 TABLE 3-20 Rule 4a and 4b - DS 1 thru 12 Bay Rule 4a. Rule 4b. Lowering RRB to increase N (FRB in high) Lowering FRB to increase T (RRB in high) 2E + # of Bays N (q) T (r) 1-4 1.75 (1.24 - G) 5-7 1.75 (1.21 - G) 0.2 (in Rule 3 - H) 8-10 1.75 (1.15 - G) 11-12 1.75 (1.09 - G) r. Loads required From Table 3-21, determine the truck and trailer loads required for the bridge. TABLE 3-21. MGB Pallets DS No. of Bays Pallet Type 1 - 3 4-6 7- 9 10-12 Erection 1 1 1 1 Bridge 4 5 6 7 Total 5 6 7 8 NOTE Additional  vehicles  are  required  to  transport  personnel.   Erection pallets may be partial depending on the bridge being built. s. Manpower and construction time From Table 3-22, determine the manpower and construction time requirements. TABLE 3-22. DS Working Parties and Building Times on Good Sites Double Story Single Span (a) 1-4 Bays (b) 5-8 Bays (c) 9-12 Bays (d) Working party 1 + 24 1 + 24 1 + 24 Time by day(hours) ¾ 1 11/2 Time by night (hours) 1 ¼ 1 ½ 2 NOTES: 1. All timings exclusive of work on approaches. 2. Add 20 percent for unskilled personnel. 3. Add 30 percent for inclement weather. 4. Add 30 percent for adverse site conditions. 3-33