Which factor is most critical when determining the design speed for a highway?

Which factor is most critical when determining the design speed for a highway?

Step 1: Understand what design speed means. Design speed is the speed at which a highway is intended to be safely traveled.
Step 2: Identify the factors that can affect design speed. These include topography (the shape of the land) and curvature (how much the road bends).
Step 3: Recognize that topography can include hills, valleys, and flat areas, which can make driving easier or harder.
Step 4: Understand that curvature refers to how sharp or gentle the turns in the road are, which also affects how fast vehicles can safely go.
Step 5: Conclude that both topography and curvature are critical because they directly impact vehicle safety and speed on the highway.

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