What are typical components of a highway design plan?

A highway design plan is a comprehensive document that incorporates various elements crucial for the successful development of a roadway. One of the primary components includes alignments, which determine the horizontal and vertical positioning of the roadway. This aspect is vital for ensuring the road follows a proper path that meets safety and operational standards.

Profiles are also essential, providing a vertical representation of the highway and helping engineers assess drainage, slopes, and the overall grade of the road. This ensures that the highway can handle traffic effectively while also managing water runoff properly.

Cross-sections complement these other components by offering a detailed view of the road's construction at various intervals, illustrating the layout of lanes, shoulders, ditches, and any embankments. This information is crucial for understanding how the road will interact with its environment and ensuring structural integrity.

By including alignments, profiles, and cross-sections in the highway design plan, planners can create a well-rounded and thorough document that addresses both functional and safety needs, along with ensuring compliance with regulatory standards. This holistic approach is what makes option B the correct choice, as it encompasses the key elements needed for effective highway design.