Examples
Examples
Try the starting example
- Parabolic crest vertical curve length (m)
- 200
- Absolute algebraic grade difference (fraction)
- 0.06
- Eye height above road (m)
- 1.08
- Object height above road (m)
- 0.6
- Geometric crest sight distance (m)
- 148.098367
- Supported geometric branch
- sight distance within curve
Try another scenario
- Parabolic crest vertical curve length (m)
- 201
- Absolute algebraic grade difference (fraction)
- 0.06
- Eye height above road (m)
- 1.08
- Object height above road (m)
- 0.6
- Geometric crest sight distance (m)
- 148.468151
- Supported geometric branch
- sight distance within curve
Calculation method
Calculation method
Geometric crest sight distance (m)
Crest curve geometry: S=√(2L(√h1+√h2)²/A) for S≤L; otherwise S=L/2+(√h1+√h2)²/A.
Supported geometric branch
Crest curve geometry: S=√(2L(√h1+√h2)²/A) for S≤L; otherwise S=L/2+(√h1+√h2)²/A.
Symbols and units
- a
- Parabolic crest vertical curve length (m)
- b
- Absolute algebraic grade difference (fraction)
- c
- Eye height above road (m)
- d
- Object height above road (m)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- User-supplied measurements and assumptions; Crest curve geometry: S=√(2L(√h1+√h2)²/A) for S≤L; otherwise S=L/2+(√h1+√h2)²/A. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.