I would like to see graphs showing the relationship between different geometric parameters and capacity results.\u00a0 <\/strong>Can you give the model a range for a parameter and then do a quick test to see how it affects RFC?<\/strong><\/p>\nQuestions such as these can easily be investigated by using the\u00a0
Analyser Screen<\/b>\u00a0in Junctions 9.<\/div>\n\n
\n- To start, click the\u00a0Analyser\u00a0<\/b>button at the bottom of the main vertical toolbar.<\/li>\n
- There are some built-in graphs which can be used to quickly produce graphs showing how queues for example vary as traffic in the junction is increased.\u00a0 To use these graphs, click the\u00a0Common X-Y graphs<\/b>\u00a0link at the top-left of the Analyser Screen and then choose one of the options.\u00a0 This will populate the rest of the screen.\u00a0 You can then click the\u00a0Line<\/b>\u00a0button in the top-left corner to generate the graph.<\/li>\n
- Graphs are produced by performing lots of runs of the traffic model, with the item of interested being varied according to the range and steps specified, and forming the x-axis of the graph.\u00a0 \u00a0Points are plotted in a random order, so that you can quickly see the shape of the graph without having to wait for it to build up from left to right.\u00a0 Each point involves running the traffic model, so the time taken to produce the graph depends on how complex the file is.<\/li>\n
- There aren't any built-in graphs that involve varying geometric parameters, but the x-axis and y-axis can be anything in the file, so you can easily create such a graph by following the steps as in the following example.<\/li>\n
- The upper panel in the Analyser Screen contains the Input Variables, which form the x-axis of the graph.\u00a0 The panel can contain several items but only one can be selected at any time.\u00a0 Use the Remove button at the bottom of the panel to remove any existing items.\u00a0 Then, to add a new item, browse to that item in the file.\u00a0 E.g. go the the roundabout geometry screen and click on Entry Width.\u00a0 The Input Variables panel should then contain a button towards the top, similar to\u00a0\"Add Arm 1 - E - Entry Width\"<\/b>.\u00a0 Click on this and that variable will be added to the list of variables and you can adjust the range and step size.<\/li>\n
- The lower panel contains the Output Variables, which form the y-axis.\u00a0 This panel can contain several items and ALL selected items will be plotted.\u00a0 You can add items in a similar way to that described above.\u00a0 E.g. go to the whole period results for Arm 1, click on the RFC, and then click the Add button towards the top of the Output Variables panel.\u00a0 To add the RFC for all other arms, you can add the RFC for each other arm individually using the same process, or, as a shortcut, you can use the \"Add all arms\/streams<\/b>\" button.\u00a0 A colour will be set automatically for each output item but you can adjust these by double clicking on the colours.<\/li>\n
- Once the input (x-axis) and output (y-axis) variables have been set up, click on the\u00a0Line\u00a0<\/b>or\u00a0Bar\u00a0<\/b>buttons at the top of the Analyser Screen to generate the graph.<\/li>\n
- If the graph is empty, it may be because the file can't be run.\u00a0 For example, you can only run a graph where the Entry Width varies if the arm has a non-zero flare length.<\/li>\n
- Once a graph has been generated, you can right-click on the diagram or on the table of numbers and copy them to the clipboard.<\/li>\n<\/ol>\n
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TIP: If your file uses Lane Simulation mode, then graphs can be slow to draw.\u00a0 In this case, try going to Data Outline>Options>Lane Simulation Options and entering the Stop Criteria Time as a small number such as 4 seconds.\u00a0 This will limit the time taken to run the simulation, meaning that the graph will generate much more quickly - although may show a lot of 'noise'.<\/div>\n
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For full details of the Analyser Screen and the other modes it offers, please see the User Guide.<\/div>\n<\/div>\t<\/article>\t
\t\t\t\t\t\t\t\tHow can I change the order of junction arms?<\/a>\t\t\t\t\t\t\t\t\tYou may sometimes need to re-order the arms at an ARCADY roundabout, for example if adding a new arm which should be inserted between the existing arms.<\/strong><\/p>\nFor example, say you have a roundabout with three arms 1,2,3, and then wish to add a fourth arm between Arm 1 and Arm 2.<\/p>\n
Start by adding the fourth arm in the usual way (use the Data Outline to add a new arm, or, right-click on an existing arm in the Junction Diagram and click 'Add another arm').\u00a0 This will add a new Arm 4, which will be positioned after Arm 3.<\/p>\n
There are then two ways you can change the arm order, as follows:<\/p>\n
\n- In the Junction Diagram, click on the name of the new arm and drag it to the new position.\u00a0 (Dragging the arm name in this way will rotate the arm around the centre of the junction.)\u00a0 Then on the main program toolbar click\u00a0