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<br /> <br />The following table establishes maximum curvature for <br />different design speeds as dependent on maximum <br />superelevation value: <br />Maximum <br />Minimum Degree <br />Design Radius Of Curve <br />Speed Maximum (Rounded) (Rounded} <br />(moh) a (Feetl (Decrees) <br />15 .06 100 53.5 <br />20 .06 115 50.0 <br />30 .06 275 21.0 <br />40 .06 510 11.5 <br />50 .06 830 7,0 <br />20 .08 100 53,5 <br />30 .OS 250 23.0 <br />40 .08 460 12.5 <br />50 .08 760 7.5 <br />e = rate oP roadway superelevation, foot per foot <br />5-502 O. Road Surface Classification <br />._.;j <br />~~=_i Road surfaces are classified as follows: <br />I. Low type surfaces are those with surface treated <br />earth surfaces and those with loose surfaces such <br />as gravel; <br />II. Intermediate type pavements are designed to retain <br />smooth riding qualities and good non-skid <br />properties in all weather under light roads and <br />low traffic volumes; and <br />IIZ. High type pavements retain smooth riding qualities <br />and good non-skid properties in all weather under <br />heavy traffic volumes and loadings with little <br />maintenance. <br />Page 5-5-11 <br />