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Skip to: Navigation , Content , Footer. One of the most tedious steps in finishing a road design has been establishing the passing and no passing zones for the permanent traffic control plan. Many attempts have been made to develop a means by which to determine the passing and no-passing zones. I've even heard of two guys, in different vehicles, with 2-way radios, trying to maintain the minimum passing distance between themselves and when they got out of sight of each other, they each threw a handful of flour out the window.
It's all based on creating a 3D model of your proposed design. The easiest way to do this is to open your proposed cross section file and invoke the XS Report dialog Modify any vertical slopes so that they're not exactly vertical. DAT file that will eventually create the. TIN file representing your proposed design. NOTE: The default extension for the output file will be.
COL , remember to change this to. DTM Menu. Key in the Side Length. Additional No Passing Distance. This is more or less a safety buffer that adds whatever distance is keyed in to each end of a no-passing zone. If no additional distance is desired, key in 1, zero is invalid.
Minimum Passing Zone Length. The MUTCD manual states, "Where the distance between successive no-passing zones is less than feet , the appropriate no-passing marking one direction or two direction should connect the zones. When pressed this button invokes the Zone Designation Table. This optional dialog is intended for designating certain areas to be treated specially.
In addition to specifying station ranges, there are two other options for more specific consideration:.
For example, if the design was going through an area that was to be double yellow striped due to it being a heavy congested area, the user would key in the Beginning and Ending Station , toggle the Side toggle to Both , toggle the Class toggle to No-Passing and click on Add. When pressed this button invokes the Sight Distance Table. This is where the various design speeds are identified. Rather than input the design speed the Minimum passing sight distance is entered.
This table allows the user to have multiple design speeds within the design and have each calculated according to its station range. These ranges and passing sight distances can be saved via the File pulldown and loaded again later for additional processing. When either the Solid or the Skip button is pressed, the Design and Computation Manager is invoked and allows the user to select the appropriate pay item to be drawn in the 2D DGN file.
The Create Report toggle and its Browse icon, are used for identifying the name of the output file and its path. These lines can be drawn Temporarily or Permanently.
The Sight Line Symbology settings buttons for left and right are where the user decides the levels, colors, weights and line styles that the sight lines are to be drawn. To adjust these settings, double click in the Left and Right rectangle areas of the dialog.
When finished with all the dialog boxes and tables, press Apply at the bottom of the Passing Sight Distance dialog box. Remember, the application is based on a proposed TIN file.
The application doesn't know anything about what exists outside of the proposed TIN file. These Information boxes are simply saying that it can't look outside of the TIN to determine whether it's safe to pass or not. These manually determined values are then entered into the Zone Designation dialog. A sample is illustrated below:. Contact Web Support. Office of Federal Lands Highway. Sight Distance. Direction of Stationing Offset. For a typical two lane highway, the driver would normally be approximately 4 ft.
Opposite Direction of Sta. Again, for a typical two lane highway, the driver would normally be approximately 4 ft.
ISBN 13: 9788416042142
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Technological Innovations in Disease Management: Text Mining US Patent Data From 1995 to 2017