superelevation

Question 1

what is the purpose of superelevation?

Answer 1

the embankment in the road to assist vehicles travelling through a hz curve at design speed

Question 2

what are the different points?

Answer 2

also Lrc, length to reverse crown, from the level crown to the reverse crown

Question 3

what is the tangent runout

Answer 3

the length along the tangent (before the TS) required to remove the crossfall of 1/2 the road width.

Question 4

what is the method used to determine the length of the tangent runout?

Answer 4

according to method #1 (TAC), runout is applied at a rate of 1:400 (i.e. tangent runout length is 400H)

Question 5

dif axis’ of ratation

Answer 5

Question 6

the width to rotate, w

Answer 6

‘w’ refers to half the road width, at base of the road, from the median to the pavement edge (not shoulder)

Question 7

superelevation development

Answer 7

Question 8

‘left’ and ‘right’ convention

Answer 8

facing higher chainage