This article presents a lesson that focuses on numeracy. In the lesson, students were tasked to find the best path for a new expressway. The purpose of the activity was for students to gain an appreciation of the complexities associated with designing public infrastructure and to put into practice the mathematical skills. This article also describes a numeracy model that could be a powerful tool when thinking about designing units and activities, because it provides a means of looking at numeracy from different perspectives. By reflecting on and reviewing a teacher's practice, teachers will also find a way to incorporate all aspects of the numeracy model.