As the towns become more densely populated town planning can be a logistical nightmare. However, with the appropriate tools, local authorities can avoid town planning mistakes by evaluating the effect of proposed changes, before making a financial commitment to change.

Traditional approaches to town planning (and its correlated businesses as car parking, shopping malls, etc.) are adequate when dealing with systems of this sophistication. What is required is a tool which permits you to rapidly experiment with different designs and operating rules, before committing to a final design. WITNESS is a tool for simulating traffic and people flows.