Structural engineering involves the analysis and design of infrastructure, mainly buildings, bridges, etc. Structural engineers use mathematics and physics to design infrastructure that can withstand certain forces. This involves analyzing the forces certain parts of a structure, such as a beam, can withhold. One major force structural engineers consider when designing and analyzing structures is gravity because an infrastructure has to have the ability to hold its own weight. In addition to gravity, they must consider other weight, such as people, vehicles, etc. Another major force structural engineers must consider is force from weather, such as wind or earthquakes. Most structural engineers design buildings and bridges, but their expertise can extend to smaller objects, such as a bookshelf. Structural engineers can also assist on construction sites. Geotechnical engineering involves the analysis of the landscape in order to provide a sturdy foundation for infrastructure. Geotechnical engineers use mathematics, physics, and environmental science to study the environment, including rocks, soil, and water, to determine if a foundation will last. They often work on developing improvements by analyzing what needs to be done underground to support a structure. Geotechnical engineers often spend their time working in offices but also will work at construction sites. They mostly research areas to make recommendations about how to proceed with construction. Traffic engineering, also known as transportation engineering, involves the analysis and design of infrastructure for safe travel. Traffic engineers not only design roadways but also railways and airports. In addition to design, they determine speed limits, traffic light placement, and sign placement. They also research and study current conditions, including accident statistics, roadway conditions, and traffic counts, in order to develop solutions to increase efficiency and safety. For the most part, traffic engineers work in an office environment, but occasionally they can work on construction sites to oversee projects. Environmental engineering involves the design of methods to decrease environmental hazards. Environmental engineers mostly deal with water purification, pollution control, and environmental investigation. They design equipment to purify air, water, and soil. Some environmental engineers use the waste to produce electricity. They also ensure that sites follow environmental rules by conducting investigations. Environmental engineers spend a portion of their time in offices working on designs and the other part of their time on sites conducting inspections. My preferred discipline of civil engineering is structural engineering. I possess a great love for not only mathematics and physics but also for infrastructure, specifically buildings and bridges. I chose structural engineering because I want to be a part of the design process for constructing structures. Based on my interests, structural engineering would be the perfect field because it will allow me to use mathematics and physics to design infrastructure. However, the field of structural engineering includes design structures that do not appeal to me as much as buildings and bridges, such as dams. Overall, structural engineering will allow me to work in a field that is centered around my interests.