Sight distance .pptx

SHANTILAL SHAH GEC ,Bhavnagar

GUIDED BYPROF. P.S.RAMANUJ

NAME ROLL NO.

GONDALIYA JAYDEEP 1043

GONDALIYA KAUSHIK M 1044

GOYANI JAYDEEP 1045

HADIYA GAUTAM 1046

HADIYAL VIJAY 1047

JADAV LALJI 1048

GROUP MEMBERS

SIGHT DISTANCE

The distance along the road surface at which a driver has visibility of objects stationary or moving at a

specified height above the carriageway is known as the sight

distance.

StoppingSight Distance Stopping sight distance is the required by a driver of a vehicle travelling a given speed to bring his vehicle to a stop after an object on the roadway becomes visible.

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OvertakingSight Distance The overtaking sight distance is that distance which should be available to enable the driver to overtake another vehicles safely and comfortable without interfering with the speed of an oncoming vehicle travelling at the design speed should it come into view after the overtaking manoeuvre is started.

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Factor affecting SSD

▪SPEED OF VEHICLE ▪EFFICIENCY OF BRAKER ▪TOTAL REACTION TIME OF THE DRIVER▪FRICTIONAL RESISTANCE BETWEEN THE

ROAD AND THE TYRES▪GRADIENT OF THE ROAD

2.5 SECOND FOR PERCEPTION + BRAKE

REACTION TIME

CONCEPTD2 = V2

254(f+0.01G)

WHERE , D2=BRAKING DISTANCE IS METERV= SPEED IN K.P.HF=COEFFICIENT OF LONGITUDINAL FRICTION BETWEEN THE TYPE AND THE PAYMENTG=LONGITUDINAL GRADE IN PERCENT

▪ SPEED OF OVERTAKING VEHICLE, SPEED OF OVERTAKEN VEHICLE & SPEED OF VEHICLE COMING FROM OPPOSITE DIRECTION

▪ DISTANCE BETWEEN THE OVERTAKING VEHICLE AND OVERTAKEN VEHICLE

▪ SKILL AND REACTION TIME OF DRIVER ▪ RULE OF ACCELERATION OF OVERTAKING

VEHICLE▪ GRADIENT OF ROAD

ODS DEPENDS UPON

SSDTHE SAFE STOPPING SIGHT DISTANCE IS MEASURED BETWEEN TWO POINTS,ONE 1.2 M ABOVE THE CARRIAGEWAY REPRESENTING THE DRIVER’S EYE AND THE OTHER 0.15 M HEIGHT REPRESENTING AN OBJECT.

Elements of OSD

Tables to compare data of SSD Vs. OSD

Design SpeedK.P.H

Safe stopping sight distance

(metres)

safe overtaking sight distance

(m)

Intermediate sight distance

(m)

40 45 165 90

50 60 235 120

60 80 300 160

65 90 340 180

80 120 470 240

13,00,000nearly people die in road crashes each year

13,00,000 people die in road crashes each year

135,000ROAD CRASH HAPPEN IN INDIA

3,287Death per day

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