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<br />. <br /> <br />. <br /> <br />E. Intersections and curves shall be evaluated for adequate sight stopping distances based on <br />the design speed. <br /> <br />1. Minimum stopping sight distances shall conform to the following design <br />standards: <br /> <br />a. The driver's eye height shall be assumed to be 3.5 feet above the <br />finished pavement. <br />b. The height of the object seen by the driver shall be assumed to be 2.0 <br />feet. <br />c. A deceleration rate of 11.2 feetls2 shall be used. <br />d. A brake reaction time of2.5 seconds shaU be used. <br />e. Minimum sight stopping distances shall be adjusted by the Professional <br />Engineer of Record, when there is a presence of vertical curves within <br />the distance needed for stopping as recommended by AASHTO's A <br />Policy on Geometric Design of Highways and Streets (Green Book) <br />where applicable. <br /> <br />2. Open space clips shall be established at all intersections. Unless larger clips are <br />indicated at a particular intersection, a 15-foot x 15-foot triangular open space <br />comer clip, as measured from the projected property line, is required at the <br />intersection of two streets. Such clips shall be part of the public right-of-way <br />and may not be located on private property. <br />3. Major thoroughfares with a centerline radius of the right-of-way less than 2000 <br />feet shall be designed in accordance with the guidelines for superelevation as <br />specified in the American Association of State Highway Transportation <br />Officials (AASHTO), A Policy on Geometric Design of Highways and Streets. <br />Signage and design speed shall be accounted for in all curved thoroughfares. <br />The maximum rate of superelevation shall be 0.06 for urban conditions. <br />4. Collector and local streets horizontal curves may be designed without <br />superelevation. <br />5. Minimum Curve Radii Lengths: <br /> <br />a. Major thoroughfares: 2000 feet. <br />b. Minor thoroughfares: 800 feet. <br />c. Collector Streets: 400 feet. <br />d. Local streets: 50 feet: <br /> <br />F. Each street shall be evaluated for adequate clearances from obstructions. Such <br />obstructions may include but are not limited to retaining walls, abutment or bridge <br />columns, sign posts, large trees, power lines or headwalls. Vertical clearances to within 2 <br />feet from the top of curb and 2 feet beyond the back of curb may be considered for <br />landscaping assuming adequate sight stopping distances are accounted for. Minimum <br />vertical clearances for all streets in the City of La Porte shall be subject to the following: <br /> <br />2. Parking garages serving passenger vehicles only - 8 feet. <br />3. Bus terminals - 12.5 feet. <br />4. Where road is expected to have 10% truck traffic on among average daily traffic <br />- 14 feet. <br />5. All cases not covered by above situations, highway systems, and roads expected <br />to convey particularly high loads - 15 to 17 feet. <br /> <br />G. For the purposes of these design standards, tangent length is defined as the distance <br />between the point of tangency and the point of curvature of two adjacent curves along the <br />centerline of the street right-of-way. <br /> <br />Paving Design Criteria Page 4 of9 <br />