Distance along tangent to Tangent distance: Superelevation rate:
any point on the spiral:
Angle of intersection of simple Area of trapezoidal section:
Offset distance from tangent curve:
to any point on the spiral: Area of three-level cross section:
External distance:
Length of throw: Area of five-level cross section:
Degree of spiral curve:
Spiral angle from tangent to any
Volume by End Area Method:
point on the spiral (in radian):
;
Length of spiral in terms of
maximum design velocity: Volume by Prismoidal Formula:
Deflection angle from TS to
any point on the spiral:
R in ft: Prismoidal Correction:
This angle is proportional to
the square of its distance Volume in a borrow pit:
R in m:
Distance along tangent to Tangent distance: Superelevation rate:
any point on the spiral:
Angle of intersection of simple Area of trapezoidal section:
Offset distance from tangent curve:
to any point on the spiral: Area of three-level cross section:
External distance:
Length of throw: Area of five-level cross section:
Degree of spiral curve:
Spiral angle from tangent to any
Volume by End Area Method:
point on the spiral (in radian):
;
Length of spiral in terms of
maximum design velocity: Volume by Prismoidal Formula:
Deflection angle from TS to
any point on the spiral:
R in ft: Prismoidal Correction:
This angle is proportional to
the square of its distance Volume in a borrow pit:
R in m:
