FORMULA CC503

SSD = 0.28tV + (V2 /254f)

SSD= 0.28tV + V2 /254[f ± ( G / 100 )]

Crest Curve :

SSD < L ;

SSD > L ;

Sag Curve :

SSD < L ;

SSD > L ;

Design Speed ( km/hr ) Stopping Sight Distance ,SSD (m)

120

100

85

70

60

50

295

215

160

120

90

70

Table 1 : SSD Based on Speed

Crest Curve

e = - ( G2 – G1) SSD/8

e > H1, SSD < L

e < H1, SSD > L

Sag Curve

e = - ( G1 – G2) SSD/8

e > H1, SSD < L

e < H1, SSD > L

HORIZONTAL CURVE

R = v2/127( e+ µ )

T = R tan ( θ / 2 )

L = θ/360 x 2π R

C = 2T kos ( θ / 2 )

M = R [ 1 – kos θ / 2 ]

Station TC = I - T

Station CT = TC + L

Intersection Design

JKR methode

I = R + a

L = ( I- a ) + ( I- a )2 + l1 + l2

Co = (1.5L + 5)

1-Y

gn = yn (Co – L)

Y

Gn = gn + 1 + R

Kn = Gn – a – R

Alternative methode

L =∑ℓ + ∑(I –k)

Co =

G = Co – L

Gi =

g = Gi + ℓ -k

S (pcu/hr) = 525W

W ( m) 3.0 3.5 4.0 4.5 5.0

S (pcu/hr) 1845 1885 1965 2210 2560

Table 2 : Saturated Flow for W < 5.5 m (JKR,1987)