Place the cursor over node #4 again, RightClick to bring up the intersection pop-up menu and select Geometry. This will bring up the geometry data entry dialog screens. There are four to eight dialog boxes (depending on the intersection type) with separate tabs at the top for identification and selection purposes. Make sure you have the Lanes box displayed on top.
In the lanes screen, enter the number of lanes shown for each movement type. Again, the Tab key moves you clockwise from field to field around the screen.
Note that lanes where lefts, through, and right (LTR) movements are all allowed are entered in the field on the outside of the through (T) lanes field.
When you have entered all of the lane data, click the Controls tab to select the intersection control type. You can specify the type of control for each approach. TRAFFIX™ will tell you if you have selected compatible control types for each pair of opposite approaches (North/south, and East/West). In the center of the screen you will see “N/S valid YES” and “E/W valid YES” if you have entered compatible control types for each approach pair. Control types are selected from the choices in the drop-down box on each approach.
In the case of intersection #4 you will need to select “protected + permitted” phasing for the north and south approaches “split” phasing for the east and west approaches.
Click the Signal Timing tab to specify minimum green times for each movement (all zeroes in this example) and the treatment of right turns in the capacity analysis. Starting with the southbound right turn movement, data entry proceeds clockwise around the screen, using the Tab key to move to the next field. Use the drop-down boxes to select the right turn treatments. Once you have gone around the intersection, the Tab key then moves you to the center of the screen where you can enter the cycle length and other data.
You can leave most of the data in this screen unchanged with the exception of the westbound right turn treatment, the loss time, and the cycle length which should be edited based upon the data.
Click the “HCM Saturation Calc Input” tab to enter the lane widths, grades, and other data for use in calculating saturation flows. The Tab key steps you through the fields.
The other dialog box tabs are used only if you want to make special adjustments to the saturation flow or delay calculations, or to input directly the green time or green/cycle ratios (g/c) instead of allowing TRAFFIX™ to calculate the G/C ratios.
Click OK when done to exit.