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irene Fan ee me a ‘x. Le Ducloux . | Yarch 22, 1950 nconcies utilize sisna os antonobdles, amropriately marie! as police vouicloa, to dientify road Liocks orerated durin: the davii cht hours, erin: the niht, flares, flash lights, and red spotii: his exo fre- quanti: used to war: noLlorists of police blockndes, Itdie ceultfal if international atancardizeation of road block ddentifiertic: methods. could bo acdiioved and Af such standardization would be particulirly uselul to motorists drivins in ceurtrica abrond,. Flonse be assure. of ry desire to cooporate in miters of mutual intorcst. Sincercly yours, Jotn Edcard Hoover Director hod