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Low•Voiurne Road Design 11.73 <br /> I <br /> T ble 4.1. Suggested seasons length (months)for the six U.S. climatic regions. <br /> Season (Roadbed Soil t.loiature Condition) <br /> U.S. <br /> Climatic Winter Spring-Thaw Spring/Fall Summer <br /> Region (Roadbed (Roadbed (Rc3dbed (Roadbed <br /> Frozen) Saturated) Viet) Dry) <br /> 1 0.0• 0.0 7.5 4.5 <br /> 11 1.0 0.5 7.0 3.5 <br /> !il 2.5 1.5 d.. 4.0 <br /> Pit 0.0 0.0 � C 8.0 <br /> V 1.0 0.� 3.0 7.5 <br /> 4'1 S.0 1.� 3.0 4.c <br /> ,•�,:nz-�e:- ci rncmns for t„e=eascn. <br /> 'fable 4.2. Suggested seasonal roadbed: it resilient moduli,IO�R(psi),as function of <br /> the relative quality of the roaCued material. <br /> Relative Season-(Roadbed Soil Moisture Condition) <br /> Quality <br /> of Winter Spring-Thaw Spring/Fall Summer <br /> Roadbed (Roadbed {Roadbed (Roadbed (Roadbed <br /> Soil Frozen) Saturated) Wet) Dry) <br /> Very Gcod 20.0001 2,500 8,000 20.000 <br /> Gr_od 20, O 2.000 6,000 10.000 <br /> Fair 20.000 2.000 4,500 6,500 <br /> Poor 20,000 1,500 3,200 4.900 <br /> Very Poor 20,CCl0 1,500 2.500 4,C00 <br /> + s mown are Resilient 1lodulu s in psi. , <br />