Overtaking Sight Distance Calculator

✖Speed of Slow moving vehicle is the speed of vehicle which has to be overtaken.ⓘ Speed of Slow moving vehicle [V_b]			+10% -10%
✖Reaction Time of Driver is the time taken by the driver from the instant the object is visible to the driver to the instant when the brakes are applied.ⓘ Reaction Time of Driver [t_r]			+10% -10%
✖Time taken for Overtaking Operation is the time taken by fast moving vehicle to overtake the slow moving vehicle.ⓘ Time taken for Overtaking Operation [T]			+10% -10%
✖Length of Wheel Base as per IRC is the distance between the center of the front wheels and the center of the rear wheels.ⓘ Length of Wheel Base as per IRC [l]			+10% -10%
✖Speed of Fast moving Vehicle is the speed of overtaking vehicle.ⓘ Speed of Fast moving Vehicle [V]			+10% -10%

✖Overtaking Sight Distance on road is minimum distance open to the vision of the driver of a vehicle intending to overtake slow moving vehicle with safety.ⓘ Overtaking Sight Distance [OSD]

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Formula

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Overtaking Sight Distance

Formula

`"OSD" = "V"_{"b"}*"t"_{"r"}+"V"_{"b"}*"T"+2*(0.7*"V"_{"b"}+"l")+"V"*"T"`

Example

`"276.832m"="11.11m/s"*"2s"+"11.11m/s"*"7.8s"+2*(0.7*"11.11m/s"+"6m")+"18m/s"*"7.8s"`

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Download Sight Distances of Highway Formulas PDF

Overtaking Sight Distance Solution

STEP 0: Pre-Calculation Summary

Formula Used

Overtaking Sight Distance on road = Speed of Slow moving vehicle*Reaction Time of Driver+Speed of Slow moving vehicle*Time taken for Overtaking Operation+2*(0.7*Speed of Slow moving vehicle+Length of Wheel Base as per IRC)+Speed of Fast moving Vehicle*Time taken for Overtaking Operation
OSD = V_b*t_r+V_b*T+2*(0.7*V_b+l)+V*T
This formula uses 6 Variables

Variables Used

Overtaking Sight Distance on road - (Measured in Meter) - Overtaking Sight Distance on road is minimum distance open to the vision of the driver of a vehicle intending to overtake slow moving vehicle with safety.
Speed of Slow moving vehicle - (Measured in Meter per Second) - Speed of Slow moving vehicle is the speed of vehicle which has to be overtaken.
Reaction Time of Driver - (Measured in Second) - Reaction Time of Driver is the time taken by the driver from the instant the object is visible to the driver to the instant when the brakes are applied.
Time taken for Overtaking Operation - (Measured in Second) - Time taken for Overtaking Operation is the time taken by fast moving vehicle to overtake the slow moving vehicle.
Length of Wheel Base as per IRC - (Measured in Meter) - Length of Wheel Base as per IRC is the distance between the center of the front wheels and the center of the rear wheels.
Speed of Fast moving Vehicle - (Measured in Meter per Second) - Speed of Fast moving Vehicle is the speed of overtaking vehicle.

STEP 1: Convert Input(s) to Base Unit

Speed of Slow moving vehicle: 11.11 Meter per Second --> 11.11 Meter per Second No Conversion Required
Reaction Time of Driver: 2 Second --> 2 Second No Conversion Required
Time taken for Overtaking Operation: 7.8 Second --> 7.8 Second No Conversion Required
Length of Wheel Base as per IRC: 6 Meter --> 6 Meter No Conversion Required
Speed of Fast moving Vehicle: 18 Meter per Second --> 18 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

OSD = V_b*t_r+V_b*T+2*(0.7*V_b+l)+V*T --> 11.11*2+11.11*7.8+2*(0.7*11.11+6)+18*7.8

Evaluating ... ...

OSD = 276.832

STEP 3: Convert Result to Output's Unit

276.832 Meter --> No Conversion Required

FINAL ANSWER

276.832 Meter <-- Overtaking Sight Distance on road

(Calculation completed in 00.019 seconds)

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Credits

Created by Adnan H Kotawala

R V College of Engineering (RVCE), Bangalore

Adnan H Kotawala has created this Calculator and 25+ more calculators!

Verified by Rachana B V

The National Institute of Engineering (NIE), Mysuru

Rachana B V has verified this Calculator and 50+ more calculators!

< 10+ OSD Calculators

Reaction Time of Driver using OSD

Go Reaction Time of Driver = (Overtaking Sight Distance on road-Speed of Slow moving vehicle*Time taken for Overtaking Operation-1.4*Speed of Slow moving vehicle-2*Length of Wheel Base as per IRC-Speed of Fast moving Vehicle*Time taken for Overtaking Operation)/Speed of Slow moving vehicle

Overtaking Sight Distance

Go Overtaking Sight Distance on road = Speed of Slow moving vehicle*Reaction Time of Driver+Speed of Slow moving vehicle*Time taken for Overtaking Operation+2*(0.7*Speed of Slow moving vehicle+Length of Wheel Base as per IRC)+Speed of Fast moving Vehicle*Time taken for Overtaking Operation

Speed of Slow Vehicle using OSD

Go Speed of Slow moving vehicle = (Overtaking Sight Distance on road-Speed of Fast moving Vehicle*Time taken for Overtaking Operation-2*Length of Wheel Base as per IRC)/(Reaction Time of Driver+Time taken for Overtaking Operation+1.4)

Total Time of Travel in Overtaking Sight distance

Go Time taken for Overtaking Operation = sqrt(4*Minimum Spacing between Vehicles during Overtaking/Acceleration)

Spacing between Vehicles given Total Time of Travel in Overtaking Sight distance

Go Minimum Spacing between Vehicles during Overtaking = ((Time taken for Overtaking Operation^2)*Acceleration)/4

Acceleration of Vehicle given Total Time of Travel in Overtaking Sight distance

Go Acceleration = (4*Minimum Spacing between Vehicles during Overtaking)/(Time taken for Overtaking Operation^2)

Minimum Spacing between Vehicles during Overtaking

Go Minimum Spacing between Vehicles during Overtaking = (0.7*Speed of Slow moving vehicle+6)

Velocity of Overtaking Vehicle for Forward Moving Vehicle Velocity in meter per second

Go Speed of Fast moving Vehicle = Speed of Slow moving vehicle+4.5

Overtaking Sight Distance given Minimum Overtaking Distance

Go Overtaking Sight Distance on road = Minimum Length of OSD/3

Minimum Overtaking Distance

Go Minimum Length of OSD = 3*Overtaking Sight Distance on road

Overtaking Sight Distance Formula

Overtaking Sight Distance in meters

Overtaking sight distance is the minimum distance open to the vision of the driver of a vehicle intending to overtake the slow vehicle ahead safely against the traffic in the opposite direction. 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.

How to Calculate Overtaking Sight Distance?

Overtaking Sight Distance calculator uses Overtaking Sight Distance on road = Speed of Slow moving vehicle*Reaction Time of Driver+Speed of Slow moving vehicle*Time taken for Overtaking Operation+2*(0.7*Speed of Slow moving vehicle+Length of Wheel Base as per IRC)+Speed of Fast moving Vehicle*Time taken for Overtaking Operation to calculate the Overtaking Sight Distance on road, The Overtaking Sight Distance is defined as the minimum distance open to the vision of the driver of a vehicle intending to overtake the slow vehicle ahead safely against the traffic in the opposite direction. It can also be defined as the sight distance required for the faster vehicle to overtake the slower vehicle safely. . Overtaking Sight Distance on road is denoted by OSD symbol.

How to calculate Overtaking Sight Distance using this online calculator? To use this online calculator for Overtaking Sight Distance, enter Speed of Slow moving vehicle (V_b), Reaction Time of Driver (t_r), Time taken for Overtaking Operation (T), Length of Wheel Base as per IRC (l) & Speed of Fast moving Vehicle (V) and hit the calculate button. Here is how the Overtaking Sight Distance calculation can be explained with given input values -> 276.832 = 11.11*2+11.11*7.8+2*(0.7*11.11+6)+18*7.8.

FAQ

What is Overtaking Sight Distance?

The Overtaking Sight Distance is defined as the minimum distance open to the vision of the driver of a vehicle intending to overtake the slow vehicle ahead safely against the traffic in the opposite direction. It can also be defined as the sight distance required for the faster vehicle to overtake the slower vehicle safely. and is represented as OSD = V_b*t_r+V_b*T+2*(0.7*V_b+l)+V*T or Overtaking Sight Distance on road = Speed of Slow moving vehicle*Reaction Time of Driver+Speed of Slow moving vehicle*Time taken for Overtaking Operation+2*(0.7*Speed of Slow moving vehicle+Length of Wheel Base as per IRC)+Speed of Fast moving Vehicle*Time taken for Overtaking Operation. Speed of Slow moving vehicle is the speed of vehicle which has to be overtaken, Reaction Time of Driver is the time taken by the driver from the instant the object is visible to the driver to the instant when the brakes are applied, Time taken for Overtaking Operation is the time taken by fast moving vehicle to overtake the slow moving vehicle, Length of Wheel Base as per IRC is the distance between the center of the front wheels and the center of the rear wheels & Speed of Fast moving Vehicle is the speed of overtaking vehicle.

How to calculate Overtaking Sight Distance?

The Overtaking Sight Distance is defined as the minimum distance open to the vision of the driver of a vehicle intending to overtake the slow vehicle ahead safely against the traffic in the opposite direction. It can also be defined as the sight distance required for the faster vehicle to overtake the slower vehicle safely. is calculated using Overtaking Sight Distance on road = Speed of Slow moving vehicle*Reaction Time of Driver+Speed of Slow moving vehicle*Time taken for Overtaking Operation+2*(0.7*Speed of Slow moving vehicle+Length of Wheel Base as per IRC)+Speed of Fast moving Vehicle*Time taken for Overtaking Operation. To calculate Overtaking Sight Distance, you need Speed of Slow moving vehicle (V_b), Reaction Time of Driver (t_r), Time taken for Overtaking Operation (T), Length of Wheel Base as per IRC (l) & Speed of Fast moving Vehicle (V). With our tool, you need to enter the respective value for Speed of Slow moving vehicle, Reaction Time of Driver, Time taken for Overtaking Operation, Length of Wheel Base as per IRC & Speed of Fast moving Vehicle and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Overtaking Sight Distance on road?

In this formula, Overtaking Sight Distance on road uses Speed of Slow moving vehicle, Reaction Time of Driver, Time taken for Overtaking Operation, Length of Wheel Base as per IRC & Speed of Fast moving Vehicle. We can use 1 other way(s) to calculate the same, which is/are as follows -

Overtaking Sight Distance on road = Minimum Length of OSD/3

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