Practical Highway Design Solutions (2013) / Chapter Skim
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Pages 46-53
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From page 46... ...
46 Appendix C Missouri dOT practical design implementation Manual NOTE: The following are the Primary Guidance statements from the MoDOT Prac�cal Design Implementa�on Manual. TYPE OF FACILITY Facility Selection • For both major and minor routes, the type of facility will be based upon the desired level of service (LOS)
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From page 47... ...
47 • Auxiliary lanes a� nterchanges facilitate traffic movements. These lanes are to be as wide as the through-traffic lanes.
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From page 48... ...
48 Roadside Ditches • Roadside ditches are to be of sufficient depth to insure drainage from the design storm event and prevent seepage under the pavement through a permeable base. • When pavement edge drains are necessary, the roadside ditch must be of sufficient depth to permit loca�on of the drain above the water surface eleva�on during the pavement drainage design event.
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From page 49... ...
49 Pavement • The Construction and Materials Division will determine the pavement thickness for all projects on major roads. During early scoping, pavement thicknesses for conceptual design and es�ma�ng purposes may be obtained from the ME (Mechanis�c-Empirical)
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50 • Freeboard for Bridges on All Routes o For a drainage area less than 20 square miles, the bridge shall have 1 foot of freeboard during a 50-year event. For a drainage area greater than 20 square miles, the bridge shall have 2 feet of freeboard during a 50-year event.
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From page 51... ...
51 Guardrail • The clear zone concept is the preferred method of providing roadside safety. • If providing the proper clear zone is imprac�cal, then shielding (concrete barrier, guardrail, or guard cable)
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From page 52... ...
52 • Pedestrian traffic generators are located near the proposed project (i.e., residen�al neighborhoods, employment centers, shopping centers, schools, parks, libraries, etc.)
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From page 53... ...
53 Design Exception • Design excep�ons are encouraged wherever the poten�al for addi�onal value lies outside of wri�en engineering policy. • Design excep�ons, using the standard form, must be completed and approved for each variance, whether the change fails to a�ain or exceeds engineering policy.
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