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Pages 40-44

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From page 40...
... 40 C H A P T E R 5 5.1 Introduction Typical issues encountered in FHWA TNM modeling of roadway sections that contain median barriers include the following: • FHWA TNM Version 2.5 has a component that addresses single reflections; however, this component is "turned off" and not available for use. • The parallel barrier module within the FHWA TNM is not intended for use with lower-height barriers such as median barriers.
From page 41...
... 41 is relatively level. The median barrier is in the center of a 10-ft wide paved median.
From page 42...
... 42 of seen traffic sources. For the example used, this sight line is shown in Figure 31, with the seen sources indicated by solid circles in Figure 32.
From page 43...
... 43 • Modeling flipped roadways and using ground zones to represent the intervening ground occupied by deleted near roadway lanes. • Modeling flipped roadways and retaining the pavement surface geometry of the near roadway lanes, but deleting traffic from these near roadway lanes.
From page 44...
... 44 Distance from Middle of Near Travel Lane (ft) Height of Receptor with Respect to Roadway Receptor Below to 6 ft Above Roadway Receptor More Than 6 ft Above Roadway 50 Model Median Barrier and Ignore Reflections Model Median Barrier and Consider Reflections 100 200 500 1000 Model Median Barrier and Consider Reflections Table 8.

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