Superelevation

Question 1

Used to partially overcome the centrifugal force on a vehicle as it goes around a curve

Answer 1

Superelevation

Question 2

_______ are needed to change the cross slope from normal crown to full bank and then back down to normal crown

Answer 2

Transition lengths

Question 3

True or false:
There are various methods for transitioning pavement from normal crown to a superelevated section

Answer 3

True

Question 4

The most common method is to rotate the pavement around the _______ (which is also the HCL and TGL)

Answer 4

centerline

Question 5

the distance used to change the section from where the adverse crown is removed (to level) to the point where full superelevation is achieved

Answer 5

Runoff

Question 6

also the length of spiral length

Answer 6

Runoff length

Question 7

Refer to _______ to get the length (function of e,
design speed and number of lanes rotated)

Answer 7

Exhibit 5-15

Question 8

the distance used to change the section from normal crown to where the adverse crown is removed (to level)

Answer 8

Runout

Question 9

Runout also occurs on the tangent

Answer 9

Circular Curves

Question 10

occurs before the PC and after the PT

Answer 10

70% of Runoff

Question 11

occurs on the curve (right after the PC and right before the PT).

Answer 11

30% of Runoff

Question 12

True or false:
The circular arc is not fully superelevated because part of the transition falls on the curve

Answer 12

True

Question 13

• Runout occurs before the TS (on the tangent) and after the ST
• Runoff occurs on length of spiral
• There is full superelevation between the SC and CS

Answer 13

Spirals

Question 14

NC is normal crown (usually _____)

Answer 14

2%

Question 15

the superelevation rate, %

Answer 15

e