ARMY TM 5-5420-212-10-1 MARINE CORPS TM 08676A-10/1-1 f. Wind Speed The wind speed permitted for each bridge length is given below.  The bridge will require lateral anchorage before crossing vehicles when wind speed exceeds those given in Table 3-5. TABLE 3-5 Maximum wind speed v bridge length 2E + No. 22 21 20 19 18 17 16 15 14 13 of Bays Bridge ft 162 156 150 144 138 132 126 120 114 108 Length m 49.4 47.6 45.7 43.9 42.1 40.2 38.4 36.6 34.8 32.9 Wind mph 50 50 95 120 120 120 120 120 120 120 Speed km/h 80.5 80.5 152.9 193.1 193.1 193.1 193.1 193.1 193.1 193.1 g. Vehicle Access An area large enough to allow the trucks and bolster trailers to completely turn around so that they can back into the site, is required adjacent to the bridge site. A vehicle park, covered and concealed, should be located from 0.3 to 3.1 miles (0.5 to 5 kms) behind the bridge site, in which the trucks and trailers can be parked after off loading. 3-6 RECONNAISSANCE REPORT a. Before  any  attempt  is  made  to  begin  installation  of  MGB,  the  unit  that  will  construct  the  bridge  should  be furnished   a   reconnaissance   report.      This   report   must   contain   the   following   information   as   a   minimum.      Minimum information will be used to determine length and type of bridge. (1) Location of the site, map coordinates or specific directions from the base camp to the site. (2) Width  of  gap  (AR  Gap)  on  bridge  centerline.    The  unit  must  know  the  AR  Gap  in  order  to  plan  the mission,  as  the  military  load  class  (MLC)  and  the  AR  Gap  will  be  applied  to  tables  to  determine  the  length  and  type  of bridge needed. b. If only the minimum information is provided, bridge unit personnel will have to conduct a reconnaissance to obtain elevations, site conditions and other design related information. 3-7 CHOICE OF BRIDGE LENGTH AND CLASS a. Bridge Length.  Use the AR gap from the reconnaissance report to find the length of bridge in Table 36.  The AR gap ranges have been computed for each bridge length, taking into account the minimum and maximum bearing for all MGB’s. b. Bridge Class.  The Military Load Class (MLC) is given in Table 36 for all bridge lengths and configurations. 3-14