To create a new road, first click the Road Tools button button and then the Start new Centreline button button to start a new centreline.

The mouse cursor will be shown as a cross when over the drawing, indicating that you should click the start position for the road centreline.

Example of New Centreline usage

After clicking the start point, a line will be shown stretching to the mouse cursor position. Click the next point to place the line, and continue placing further IPs (Intersection Points) to describe the path of the road centreline.

If you have imported a layout drawing, you may have the centreline already shown on the drawing. In this case, you can snap to the the visible points and arcs by right-clicking the mouse and selecting Snap to Point and Snap to Arc from the menu:

New Centreline menu

You would usually use Snap to Point to select the start of the centrelne, then switch to Snap to Arc to add each curve along the line, and then swicth back to Snap to Point to select the end point.

Note: Avoid placing IPs on the ends of arcs. Doing so would allow the centreline to become non-tangential.

With Snap to Arc selected, the arcs highlight as you move the mouse near and you can click to add to the centreline path:

Snap to arc example

Note: You can also use the various snap options on the snap toolbar, and make temporary construction lines using the construction line toolbar.

Also, you can right-click the mouse to get a menu where you can select Enter Coordinate to type the desired coordinate on the keyboard.

Right-click menu for entering a coordinate Window for entering a coordinate via the keyboard

When you have finished placing the IP points for your road centreline path, right click the mouse and select Finish from the menu. The new road centreline shows as a red line on the drawing.

The vertical alignment of the centreline will initially be a straight grade from start to end along the horizontal path. The start and end levels are automatrically taken from the survey ground heights at the start and end points. To design the vertical alignment of the road use the Centreline Longsection facility.

You can enhance the road with the following options from the toolbar:


See Also: