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<br />. <br /> <br />. <br /> <br />I. The minimum tangent length between reverse curves shall be 100 feet on principal <br />arterials, minor arterials, major collector streets, and minor collector streets. <br />2. The minimum tangent length between reverse curves shall be 50 feet on all local <br />streets. <br /> <br />H. Intersections <br /> <br />1. Curb radii, measured from the face of curb, shall be 25 feet minimum on major <br />and minor arterials. The minimum curb radius shall be 20 feet on collector and <br />local streets. A minimum of a 30-foot radius will be required at skewed <br />intersections on arterials. A minimum 25-foot radius shall be required at <br />skewed intersections on collector and local street. <br />2. Streets and traffic lanes should be aligned across an intersection. Except where <br />existing conditions will not pennit, all streets should intersect at a 90 degree <br />angle. The maximum allowable skew across an intersection shall be 5 degrees <br />for arterial streets, and 10 degrees on all collector and local streets. <br />3. When turnouts are provided at an existing street, the ultimate cross section is <br />required to the end of the curb return. Pavement transition is required to reduce <br />the pavement width to the existing cross section. <br />4. Minimum intersection distances as measured nearest right-of-way line to nearest <br />right-of-way line shall be as follows: <br /> <br />a. Streets intersecting major arterials: 200 feet. <br />b. Streets intersecting minor arterials: 150 feet. <br />c. Streets intersecting collector and local streets: 125 feet <br /> <br />5. Proposed streets shall be aligned with existing streets where possible. Offset <br />intersections shall be avoided at all costs and shall not be pennitted if the offset <br />distance is less than 125 feet. <br />6. Lane drop tapers shall extend a minimum of 50 feet beyond the intersection. <br /> <br />I. Minimum lane transition lengths shall meet or exceed requirements of the Texas Manual <br />of Uniform Traffic Control Devices (I'MUTCD). Pavement width transitions shall <br />confonn to the following design standards: <br /> <br />1. Minimum deceleration lengths for auxiliary turning lanes on grades of less than <br />or equal to 3%, with an accompanying stop condition, for design speeds of 30, <br />40, 45, 50, 55 mph are 230, 330, 430, 550 and 680 feet respectively. These <br />lengths exclude the taper lengths. <br />2. Taper lengths should be calculated for roads with design speeds greater than or <br />equal to 45 mph by using taper lengths (L) equal to 0.6 times the design speed <br />(S) multiplied by the offset (W), L=0.6SW. For design speeds less than 45 mph, <br />the taper length (L) equals the offset multiplied by the design speed (s) squared, <br />then divided by 155, L=WS2/155. The distance for tapers should be lengthened <br />if the road is curved based on recommendations from the Professional Engineer <br />of Record. <br /> <br />J. Left Turn Lanes <br /> <br />I. Minimum storage bay lengths need to be supplied for at least 2 passenger <br />vehicles; or for the number of left turning vehicles likely to arrive at the <br />intersection in an average 2 minute span in the peak hour of traffic. If there is a <br />presence of more than 10% trucks in the average daily traffic, then the storage <br />bay length should be for I passenger car and I truck. <br /> <br />Paving Design Criteria Page 5 of9 <br />