STOPPING SIGHT DISTANCE | SIGHT DISTANCE OF GEOMETRIC DESIGN STANDARDS FOR NON-URBAN HIGHWAYS | STOPPING SIGHT DISTANCE (SSD) OF NON-URBAN HIGHWAYS

                            

STOPPING SIGHT DISTANCE  | SIGHT DISTANCE OF GEOMETRIC DESIGN STANDARDS FOR NON-URBAN HIGHWAYS | STOPPING SIGHT DISTANCE (SSD) OF  NON-URBAN HIGHWAYS  

INTRODUCTION :

SIGHT DISTANCE:

Sight distance is the length of roadway visible to a driver. The three types of sight distance common in roadway design are intersection sight distance, stopping sight distance, and passing sight distance.

Stopping Sight Distance (SSD):

Stopping sight distance (SSD) is the minimum sight distance available on a highway at any spot having sufficient length to enable the driver to stop a vehicle traveling at design speed, safely without collision with any other obstruction.

SSD = Lag distance + Braking distance

v2

SSD = v t + 2g(f ± 0.01n)                                                     

 

v	=	Design speed (m/s)
t	=	Reaction time of driver (s) (2.5 seconds as per IRC guidelines)
f	=	Design longitudinal friction coefficient (Refer Table 1.7)
g	=	Acceleration due to gravity = 9.8 m/s2
n	=	Gradient of road (%) (+ for ascending and – for descending)

 Recommended longitudinal friction coefficient for providing SSD

Speed (km/h)	20-30	40	50	60	65	80	≥100
Longitudinal friction coefficient	0.40	0.38	0.37	0.36	0.36	0.35	0.35

 

 Recommended Stopping Sight Distance for different speeds

Speed (km/h)	20	25	30	40	50	60	65	80	100
SSD (m)	20	25	30	45	60	80	90	120	180

 

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