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<br />- to prevent erosion. Areas undisturbed by construction <br />shall be left in their present vegetative state, except <br />that thinning of trees may be required. Rights-of-way <br />shall be cleared to the minimum width necessary to <br />construct the roadway, provide for drainage, and <br />provide adequate snow storage. <br />5-502 FF. Guardrail <br />Guardrail shall be installed on the outside of curves <br />as required in this Section or by the County Engineer <br />to prevent accidents by delineating roadbed, reducing <br />accident severity by deflecting vehicles into safer <br />paths, and reducing the rate of deceleration in case of <br />impending collisions with fixed objects. When <br />guardrail is used in conjunction with roadside curb, <br />the face of the guardrail shall be flush with the face <br />of the curb regardless of shoulder width to prevent the <br />take-off ramp effect which may overturn a vehicle. <br />When no curb is present, the face of the guardrail <br />shall be flush with the edge of the shoulder. <br />I. On curves requiring a reduction in approach <br />speeds, any of the following conditions shall <br />indicate that guardrail installation may be <br />required on the outside of curves: <br />a. Height of embankment exceeds 10 feet; <br />b. Side slopes exceed 4:1; <br />c. Shoulder or pavement widths are substandard; <br />d. Roadside hazards exist. <br />II. Whether on curves or tangents, guardrail may be <br />required if a history of roadway accidents exists <br />or if unusually high embankments or steep terrain <br />give motorists a feeling of insecurity. <br />III. In areas subject to dense fog or snow and ice <br />conditions, or where traffic speed and volumes are <br />high, guardrail may be required. <br />IV. An obstruction or sudden constriction on width may <br />require guardrail. <br />V. An isolated sharp curve on a road otherwise built <br />to higher standards may require guardrail. <br />VI. Guardrail may be required at approaches to bridge <br />' piers, abutments, trees, or other obstructions. <br />Page 5-5-29 <br />