Freeway

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Freeway

Main Input Screen The main input screen (see Figures below) is where the roadway geometry is specified. This is done by adding segments/links where you can set the length, initial angle, free-flow speed, grade, and so on. You can insert a basic segment, on-ramp segment, or off-ramp segment with the toolbar buttons above the segment table. Click ‘Delete Link’ to delete the currently selected segment. The segment characteristics assume an east-to-west or north-to-south direction of entry.





Segment Input Fields Most of the input fields for the freeway facility are the same as for the two-lane highway facility. The only differences are that the freeway has an input for the number of lanes for the segment and does not include inputs for a passing lane.

Detectors The detector input screen for the freeway facility only accommodates one direction. To set detectors on a segment click on ‘Set’ under ‘Set Detector(s)’ to open the Detectors dialogue box (see Figure below).



Entering Traffic Data For a freeway facility, traffic enters at the beginning of the mainline and from each on-ramp. The traffic data entry dialog (similar to the one for two-lane highways, but for just one direction) can be accessed for each facility entry point by pressing the ‘Set’ button under the ‘Traffic Data’ column. This button will be highlighted in yellow for the segments for which entering traffic data can be specified.

Exiting Traffic Data For off-ramp segments, the exiting percentage of traffic needs to be specified. This entry is accessed in the same way as for the entering traffic data.

To save your created network and traffic data to disk, see Section Getting Started. To run the simulation, see Section Running the Simulation. Following successful completion of the simulation, you can view the results in the animation window (see Section Animation).