sight distance .pptx
TRANSCRIPT
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.
1
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.
2
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
