Traffic and transportation engineers in Concord are civil engineers who use engineering techniques to achieve safe and efficient movement of people and goods. They focus mainly on research and construction of the infrastructure necessary for safe and efficient traffic flow, such as road geometry, sidewalks, and crosswalks, segregated cycle facilities, traffic signs, road surface markings and traffic lights. They also design traffic control device installations, investigate locations with high crash rates and develop countermeasures to reduce these crashes, develop systems for intelligent transportation systems, and estimate the impact of commercial developments on traffic patterns.