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<br />. <br /> <br />e <br /> <br />'. <br /> <br />shall slope not less than one-eighth (1/8) inch per foot <br /> <br />for Portland cement concrete. The minimum drop <br /> <br />around curb return will be one -tenth (1/10) of one (1) <br /> <br />foot, The maximum drop of grade tangents from op- <br /> <br />posite directions to a common low point shall not ex- <br /> <br />ceed one and one-half (1-1/2) feet. All gutter grades <br /> <br />shall be above the design water surface of ditches and <br /> <br />storm sewers. All grade changes with an algebraic <br />difference of one (1) per cent or more shall be con- <br /> <br />. <br /> <br />nected with a vertical curve. <br /> <br />3. Width: Minimum width of streets shall be as follows: <br /> <br />Classification <br /> <br />Row <br />Width <br /> <br />Street width back <br />to back of curb <br /> <br />Major Streets <br />Secondary or <br />Collector <br />Local or <br />Residential <br /> <br />80' <br />60' <br />50' <br /> <br />60' <br /> <br />40' <br /> <br />28' <br /> <br />4. <br /> <br />Pavement Design: <br /> <br />Pavement design shall conform to <br /> <br />the following general requirements unless otherwise ap- <br /> <br />. <br /> <br />proved by the Planning Commission and City Engineer. <br /> <br />References to Texas Highway Department specifications <br /> <br />regarding street work are references to the "Standard <br /> <br />Specifications for Road and Bridge Construction", adopted <br /> <br />by the State Highway Department of Texas, January 2, 1961. <br /> <br />(a) Concrete Pavement: Concrete pavement shall con- <br /> <br />form to the requirements of Item 360 Texas Highway <br /> <br />Department, Standard Specification. Concrete <br /> <br />pavements shall have a minimum thtckness of si~ <br /> <br />(6) inches for Local or Residential Streets and a <br /> <br />e <br /> <br />minimum thickness of seven (7) inches for Secondary <br /> <br />24 <br />