tailieunhanh - Design Manual Metric 2009 Part 8

Tham khảo tài liệu 'design manual metric 2009 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CAT 1 2 3 P YES A SYRO Inc. Brakemaster 2 P YES A Energy Absorption Systems Inc. QuadTrend - 350 6 P NO A Energy Absorption Systems Inc. QuadGuard B - 4 NO C 5 Energy Absorption Systems Inc. QuadGuard Elite P NO D Energy Absorption Systems Inc. REACT 350 B - 4 NO C 5 Roadway Safety Service Inc. Wide REACT 350 B - NO D 5 Roadway Safety Service Inc. Inertial Barriers B - 4 NO 2 A 5 3 ADIEM II 7 T NO B SYRO Inc. GREAT cz 9 T NO 2 C 5 Energy Absorption Systems Inc. n-e-a-t 8 T NO 2 C 5 Energy Absorption Systems Inc. Initial Cost Categories A 5 000 to 8 000 B 9 000 to 14 000 C 15 000 to 25 000 D 25 000 to 40 000 1 Generally for use with double sided beam guardrail. Use as an end treatment for concrete barrier requires a transition. 2 The GREAT cz inertial barriers and N-E-A-T may only be used beyond the required barrier length of need. 3 There are 3 manufacturers of inertial barriers Energy Absorption Systems Inc. Roadway Safety Service Inc. TrafFix Devices Inc. 4 See Figure 720-1 for sizes or configuration type. 5 The length of the QuadGuard REACT 350 and inertial barriers varies since their design is dependent upon speed. For a typical 60 mph design the QuadGuard design would be meters the REACT 350 would be meters and the inertial barriers would be 9 meters. Costs indicated are for a typical 60 mph design. 6 Generally for use at the ends of bridges where a standard beam guardrail installation is not feasible. 7 Generally for use with concrete barrier. Other uses may require a special transition design. 8 Use limited to highways with posted speeds of 45 mph or less. 9 Limit to one-way traffic flow. Impact Attenuator Comparison Figure 720-5 Impact Attenuator Systems Page 720-12 Design Manual June 1999 810 Construction Work Zone Traffic Control Strategy General The .