Horizontal and Vertical Curve

Two main types of curve in roadway design is (can be more than one answer)

• horizontal

• vertical

• incline

• plane

Compound, reverse and simple curves are the three types of

• horizontal curve

• vertical curve

• incline curve

• quarter curve

T and U are

• length of curve

• long chord

• tangent length

• tangent points

Chainage is a

• measure of a vertical distance from a starting point to a particular point

• measure of length from starting point to a particular point

• measure of angle from a starting point to a particular point

• measure of reduced level of points on the ground surface

Formula to calculate tangent length in designing a horizontal curve is

• $R\sin\ \frac{\theta}{2}$

• $R\theta\ \frac{\pi}{180}$

• $R\tan\ \frac{\theta}{2}$

• $R\cos\ \frac{\theta}{2}$

Two types of vertical curve are (can be more than 1 answer)

• crest

• up

• sag

• down

Formula to calculate algebraic difference is

• $A=m-n$

• $A=m+n$

• $A=m\div n$

• $A=m\times n$

Two types of sight distance are (can be more than one answer)

• Illumination Sight Distance

• Stopping Sight Distance

• Full Overtaking Sight Distance

• Height of object

Based on design speed table, determine the K value used to design a sag curve if the design speed is 50 km/h.

• 9

• 37

• 26

• 6.5

Minimum length of curve can be calculated using the formula

• $K=L_{\min}A$

• $L_{\min}=KA$

• $L_{\min}=2KA$

• $L_{\min}=K-A$