This drawing shows a section of highway. For vehicles going left, there is a stop sign ahead. For vehicles going right, the surface of the highway can be slippery when wet.

If you haven't already done so, first download the free trial version of RFFlow. It will allow you to open any drawing and make modifications.

Once RFFlow is installed, you can open the above drawing in RFFlow by clicking on Highway.flo. From there you can zoom in, change the text, change colors, print and fully customize this sample drawing. It is often easier to modify an existing drawing than to draw it from scratch.

On the above drawing, each grid unit represents 1 foot. This is established by clicking on Tools, and Dimensions on Lines.

To edit the text, you can either double-click or right-click and choose Edit Text from the menu that appears.

The highway is a large rectangle from the Sample stencil filled with a dark gray color. It is placed in the background so the cars are on top of the highway. To move shapes to the front or back, right-click on them, choose Properties, and go to the Layers tab. In the bottom of this tab, select the stacking order.

You can move a line by dragging it or change its length by single clicking on it and dragging one of the handles. Green handles appear when you click on a shape, line or curve. Drag these handles to size the object.

To change colors and other properties, right-click on the line or shape and select Properties in the menu. To duplicate a line or shape, right-click on it and choose Duplicate. To delete a shape or line, right-click on it and choose Delete.

In general, you drag objects to move them, left-click to size them, and right-click to change their text or properties.

To create this drawing without downloading it, run RFFlow and click the More Shapes button. Open the Transportation folder and click on the Roads stencil. Then click the Add Stencil button.