CURVES

CurveA line which is not straight with no sharp edges is called a curve. It is a smoothly flowing line.

Types of Curves

1.Horizontal Curve

2.Vertical Curve

Horizontal CurveA horizontal curve provides a transition between two tangent strips of roadway, allowing a vehicle to negotiate a turn at a gradual rate rather than a sharp cut.

Types of Horizontal

Curves1.Simple Curve

2.Compound Curve

3.Reverse Curve

4.Transition Curve

SIMPLE CURVEA simple arc provided in the road to impose a curve between the two straight lines.

COMPOUND CURVECombination of two simple curves combined together to curve in the same direction.

REVERSE CURVECombination of two simple curves combined together to curve in the opposite direction.

TRANSITION CURVEA curve of constantly changing radius, used to connect a circular arc to a straight line.

Vertical CurveA vertical curve provides a transition between two sloped roadways, allowing a vehicle to negotiate the elevation rate change at a gradual rate rather than a sharp cut.

Types of Vertical Curve

1.Sag Curve

2.Crest Curve

SAG CURVESag Curves are those which change the alignment of the road from uphill to downhill.

CREST CURVECrest Curves are those which change the alignment of the road from downhill to uphill.

THE END

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