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F)' Newmont I County Road 82 Guardrail Analysis <br /> J Appendices <br /> Appendices <br /> Appendix A: Roadside Design Guide Table 3-1 <br /> U.S.Customary Units <br /> Of>siDr► Foregoes* Backslops , <br /> Speed � 1V:fdll 1V:SH to 1V:3H 1V:3H 1V:SH to 1V:SH <br /> ( : : <br /> ) or flatter 1V:4H 1V:4H or flatter <br /> UNDER 750- 7-10 7-10 1-10 T-10 7-10 <br /> <40 750-1500 10 12 12-14 12 14 12-14 17-14 <br /> 1500-6000 12-14 14-16 14-16 14-16 14-16 <br /> OVER 6000 14-16 16-18 ^ 16-18 16-18 16-18 <br /> - <br /> UNDER 750' 10-12 12-14 6-10 8-10 10-12 <br /> 45-50 750-1500 14-16 16-20 ^ 10-12 12-14 14-16 <br /> 1500-6000 16-18 20-26 - 12-14 14-16 16-18 <br /> OVER 6000 20-22 24-28 - 14-16 18-20 2022 <br /> UNDER 750' 12-14 14 18 = 8-10 10-12 10-12 <br /> 55 750-1500 16-18 20-24 ° 10-12 14-16 16-18 <br /> 1500 6000 20-22 24-30 ° 14-16 16-18 20-22 <br /> OVER 6000 22-24 26-32^ ° 16-18 20-22 22-24 <br /> UNDER 750` 16-18 20-24 ° 10-12 12-14 14-16 <br /> 750-1500 20-24 26-32^ 6 12-14 16-18 20-22 <br /> so 1500-6000 26-30 32-40' ° 14-16 18-22 24 26 <br /> OVER 6000 30-32' 36 44• 20-22 24-26 26-28 <br /> UNDER 750' 18-20 20-26 10-12 14-16 14-16 <br /> 65-70 750--1500 24-26 28-36' 12-16 18-20 20-22 <br /> 1500-6000 28-32° 34 42' - 16-20 22.24 26-28 <br /> OVER 6000 30-34^ 38-46' - 22-24 26-30 28-30 <br /> Notes: <br /> al When a site-specific investigation indicates a high probability of continuing crashes or when such occurrences are indicated by crash history, <br /> the designer may provide clear-zone distances greater than the clear zone shown in Table 3.1.Clear zones may be limited to 30 ft for practicality <br /> and to provide a consistent roadway template it previous experience with similar projects or designs indicates satisfactory performance. <br /> b)Because recovery is less likely on the unshielded,traversable 1V:3H fill slopes,fixed objects should not be present in the vicinity of the toe of <br /> these slopes.Recovery of high-speed vehicles that encroach beyond the edge of the shoulder may be expected to occur beyond the toe of <br /> slope.Determination of the width of the recovery area at the toe of slope should consider right-of-way availability,environmental concerns, <br /> economic factors,safety needs,and crash histories.Also,the distance betvveen the edge of the through traveled lane and the beginning of <br /> the 1V:3H slope should influence the recovery area provided at the toe of slope.While the application may be limited by several factors,the <br /> foreslope parameters that may enter into determining a maximum desirable recovery area are illustrated in Figure 3.2.A 10-ft recovery area at <br /> the toe of slope should be provided for all traversable,non recoverable fill slopes. <br /> Cl For roadways with low volumes it may not be practical to apply even the minimum values found in Table 3-1.Refer to Chapter 12 for additional <br /> considerations for low-volume roadways and Chapter 10 for additional guidance for urban applications. <br /> di When design speeds are greater than the values provided, the designer may previae clear-zone distances greater than those shown in <br /> Table 3-1. <br /> hdrinc.com 2060 Briargate Parkway,Suite 120,Colorado Springs,CO 80920-1045 <br /> (719)272-8800 - <br /> 5 <br />