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Aerial of MDOT M-231 highway and overpass
Aerial view of the West Seneca Roundabout

aerial of highway overpass

Highway design engineers are responsible for designing safe roadways and transportation systems for safe, everyday travel. They analyze traffic patterns to determine the overall layout of the roadway and take into consideration how the design may impact the surrounding communities and environment. Highway design engineers are well versed in computer-aided design (CAD) software programs, and modelling tools to create detailed and efficient designs for small- and large-scale projects. They also collaborate with traffic engineers, structural engineers, and site/civil engineers. Whether in an urban or rural area, highway designs are constantly being improved for safety and ease of use.  

Depending on your project needs, the type of software you choose to design highways and roadways may vary. Some of the most used software by highway engineers include Civil 3D (AutoDesk), OpenRoads Designer, InfraWorks, and AutoCAD. Each program offers different features to help accelerate your success. From BIM software to 3D modeling and grading capabilities, designing roads can be made easier and more efficient using these cutting-edge tools.  

Prior to designing a highway, engineers must consider many important factors before construction. Determining the location of highway, economic feasibility, cost, projected flow of traffic, and safety of travelers and surrounding communities are paramount when designing a highway. Additionally, engineers must remain cognizant of how their design may impact the environment and its ecosystems. After these factors are taken into consideration, highways are constructed through a series of planning and design. Moreover, surveys are conducted to evaluate the soil condition and topography of the site. Site preparation then takes place which may involve removing existing structures or vegetation. Next, the base and subbase are laid down in layers to support the weight of vehicles. After this takes place, paving and compaction occur where asphalt is distributed and compacted by machinery to ensure the road is smooth. Once complete, road markings and various symbols are placed on the road to guide drivers and enhance safety while traveling.  

The profile grade line is typically located on the centerline of the roadway.