During the summer months, Yuma, Arizona, is a mid-sized city with approximately 85,000 residents. In the winter months, however, the population increases as people migrate to the city to escape the colder climates. This migration leads to increased traffic congestion and pedestrian safety concerns when students are walking to school. In 2007, the Yuma Elementary School District #1 organized a parade to school at Desert Mesa Elementary School and O.C. Johnson Elementary School to promote safe and healthy places for the children to walk and bicycle to school.