▁is ▁pushed ▁into ▁the ▁ground ▁and ▁a ▁scale ▁reads ▁off ▁the ▁estimated ▁C BR ▁value . ▁ ▁It ▁is ▁a ▁quick ▁and ▁simple ▁means ▁of ▁estim ating ▁the ▁C BR ▁of ▁the ▁top ▁ 0 . 5 ▁metres ▁of ▁sub grade ▁but ▁is ▁less ▁accurate ▁than ▁the ▁more ▁involved ▁standard ▁C BR ▁test . ▁ ▁Ex pert ise ▁is ▁required ▁where ▁gran ular ▁material ▁is ▁present ▁in ▁the ▁soil . ▁ ▁The ▁use ▁of ▁the ▁M EX E ▁Pro be ▁can ▁be ▁dangerous ▁where ▁under ground ▁services ▁are ▁present . ▁ ▁M EX E ▁system ▁ ▁M EX E ▁were ▁pione ers ▁in ▁the ▁field ▁of ▁terrain ▁evaluation , ▁where ▁the ▁terrain ▁is ▁ass essed ▁and ▁categor ised ▁based ▁on ▁a ▁number ▁of ▁characteristics . ▁ ▁Are as ▁were ▁divided ▁into ▁fac ets ▁of ▁land ▁broad ly ▁hom ogeneous ▁in ▁morph ology , ▁water ▁regime ▁and ▁surface ▁material ▁from ▁a ▁ 1 : 5 0 , 0 0 0 ▁scale ▁map . ▁ ▁Similar ▁fac ets ▁were ▁grouped ▁into ▁rec urr ing ▁landscape ▁patterns ▁whilst ▁anom alous ▁parts ▁of ▁fac ets ▁were ▁split ▁off ▁as ▁sub fac ets . ▁ ▁This ▁became ▁known ▁as ▁the ▁M EX E ▁system ▁and ▁allows ▁detailed ▁terrain ▁intelligence ▁to ▁be ▁ext rap ol ated ▁from ▁similar ▁terrain ▁in ▁the ▁region ▁and ▁provided ▁to ▁the ▁commander ▁on ▁the ▁ground . ▁ ▁The ▁system ▁was ▁implemented ▁at ▁a ▁wide ▁variety ▁of ▁scales ▁from ▁theatre ▁and ▁army ▁corps ▁( where ▁the ▁fac ets ▁might ▁be ▁tens ▁of ▁kilometres ▁in ▁size