The following are the instrumental methods used for setting out horizontal circular curve.
(i) Rankine's method of tangential angle
(ii) Two theodolite method
(iii) Tacheometric method
The sequence of these methods from the least accurate to the most accurate is
1
(i), (ii), (iii)
2
(iii), (i), (ii)
3
(ii), (iii), (i)
4
(i), (iii), (ii)