NICET - Highway Construction Inspection Practice Exam

What is the middle ordinate distance formula used to calculate?

1. Maximum elevation of a curve

2. Distance from the arc to the chord

3. Centrifugal force on a highway

4. Length of a horizontal curve

The correct answer is: Distance from the arc to the chord

The middle ordinate distance formula is specifically utilized to calculate the distance from the arc of a circular curve to the corresponding chord that connects the endpoints of that arc. This measurement is important in the design and layout of vertical and horizontal curves in highway construction. In practical terms, the middle ordinate is a measure of how far the arc deviates from the straight line connecting its endpoints (the chord). This information helps engineers and designers to ensure that the curve is not only smooth and aesthetically pleasing but also safe for vehicles traveling along the roadway. Understanding the middle ordinate is essential, as it directly influences the sight distance, superelevation, and overall geometry of the roadway, impacting driver comfort and safety. The other choices either relate to different concepts in road design or calculation and do not pertain to this specific measurement.