Considering that sight distance approximates to a straight line for a horizontal curvature with large radius, and that the sight distance length lies within the curve length. the relationship between the radius (R), Minimum Offset Clearance (Ms) and sight distance (SD) can be expressed as:

A

Ms = SD$$^2$$/6R

B

Ms = SD$$^2$$/8R

C

Ms = 8R$$^2$$/SD

D

Ms = 6R$$^2$$/SD