If you read "InfraWorks 360: Use a simple script to add Google Map links to tooltips," you'll notice that I referenced an avoidance area (aka avoidance zone). However, what I didn't explain in that post, is:
How can I use avoidance zones in my InfraWorks 360 projects?
The short answer is that you use avoidance zones to specify areas to avoid when optimizing the horizontal path of a design road. Any avoidance areas you add to your model will be included as cost zones, and factored into construction and earthwork cost estimates for the optimal design of the selected road corridor.
Why would I use them?
Optimization, Avoidance Zones and other InfraWorks 360 cloud services often provide you with "sustainability-first" design options (to quote a recent article in The Atlantic) that can help you lessen environmental and other impacts in your designs. Using Avoidance Zones, you can design a roadway and factor in sustainability aspects while you're still in the conceptual design process.
Keep reading for step-by-step instructions on how to use Corridor Optimization (preview) and Avoidance Zones to avoid protected, restricted, or otherwise off-limits project areas and manage associated construction and earthwork costs.