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Overtaking Sight Distance Formula

GoOvertaking Sight Distance given Minimum Overtaking Distance Formula

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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. Check FAQs

OSD = V b \cdot t r + V b \cdot T + 2 \cdot (0.7 \cdot V b + l) + V \cdot T

OSD - Overtaking Sight Distance on road?V_b - Speed of Slow moving vehicle?t_r - Reaction Time of Driver?T - Time taken for Overtaking Operation?l - Length of Wheel Base as per IRC?V - Speed of Fast moving Vehicle?

Overtaking Sight Distance Example

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Here is how the Overtaking Sight Distance equation looks like with Values.

Here is how the Overtaking Sight Distance equation looks like with Units.

Here is how the Overtaking Sight Distance equation looks like.

276.832 = 11.11 \cdot 2 + 11.11 \cdot 7.8 + 2 \cdot (0.7 \cdot 11.11 + 6) + 18 \cdot 7.8

276.832m = 11.11m/s \cdot 2s + 11.11m/s \cdot 7.8s + 2 \cdot (0.7 \cdot 11.11m/s + 6m) + 18m/s \cdot 7.8s

276.832 = 11.11 \cdot 2 + 11.11 \cdot 7.8 + 2 \cdot (0.7 \cdot 11.11 + 6) + 18 \cdot 7.8

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Overtaking Sight Distance Solution

Follow our step by step solution on how to calculate Overtaking Sight Distance?

FIRST Step Consider the formula

OSD = V b \cdot t r + V b \cdot T + 2 \cdot (0.7 \cdot V b + l) + V \cdot T

Next Step Substitute values of Variables

∴

OSD = 11.11m/s \cdot 2s + 11.11m/s \cdot 7.8s + 2 \cdot (0.7 \cdot 11.11m/s + 6m) + 18m/s \cdot 7.8s

Next Step Prepare to Evaluate

∴

OSD = 11.11 \cdot 2 + 11.11 \cdot 7.8 + 2 \cdot (0.7 \cdot 11.11 + 6) + 18 \cdot 7.8

LAST Step Evaluate

∴

OSD = 276.832m

Overtaking Sight Distance Formula Elements

Variables

Overtaking Sight Distance on road

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.

Symbol: OSD

Measurement: LengthUnit: m

Note: Value should be greater than 5.

Formulas to find Overtaking Sight Distance on road

Speed of Slow moving vehicle

Speed of Slow moving vehicle is the speed of vehicle which has to be overtaken.

Symbol: V_b

Measurement: SpeedUnit: m/s

Note: Value should be greater than 5.

Formulas to find Speed of Slow moving vehicle

Reaction Time of Driver

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.

Symbol: t_r

Measurement: TimeUnit: s

Note: Value should be between 1 to 10.

Formulas to find Reaction Time of Driver

Time taken for Overtaking Operation

Time taken for Overtaking Operation is the time taken by fast moving vehicle to overtake the slow moving vehicle.

Symbol: T

Measurement: TimeUnit: s

Note: Value should be greater than 1.5.

Formulas to find Time taken for Overtaking Operation

Length of Wheel Base as per IRC

Length of Wheel Base as per IRC is the distance between the center of the front wheels and the center of the rear wheels.

Symbol: l

Measurement: LengthUnit: m

Note: Value should be greater than 2.

Formulas to find Length of Wheel Base as per IRC

Speed of Fast moving Vehicle

Speed of Fast moving Vehicle is the speed of overtaking vehicle.

Symbol: V

Measurement: SpeedUnit: m/s

Note: Value should be greater than 5.

Formulas to find Speed of Fast moving Vehicle

Other Formulas to find Overtaking Sight Distance on road

Go Overtaking Sight Distance given Minimum Overtaking Distance

OSD = \frac{D}{3}

Other formulas in OSD category

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

V = V b + 4.5

Go Total Time of Travel in Overtaking Sight distance

T = \sqrt{4 \cdot \frac{s}{a}}

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

s = \frac{(T^{2}) \cdot a}{4}

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

a = \frac{4 \cdot s}{T^{2}}

How to Evaluate Overtaking Sight Distance?

Overtaking Sight Distance evaluator 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 evaluate 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 evaluate Overtaking Sight Distance using this online evaluator? To use this online evaluator 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.

FAQs on Overtaking Sight Distance

What is the formula to find Overtaking Sight Distance?

The formula of Overtaking Sight Distance is expressed as 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. Here is an example- 276.832 = 11.11*2+11.11*7.8+2*(0.7*11.11+6)+18*7.8.

How to calculate Overtaking Sight Distance?

With 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) we can find Overtaking Sight Distance using the formula - 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.

What are the other ways to Calculate Overtaking Sight Distance on road?

Here are the different ways to Calculate Overtaking Sight Distance on road-

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

Can the Overtaking Sight Distance be negative?

No, the Overtaking Sight Distance, measured in Length cannot be negative.

Which unit is used to measure Overtaking Sight Distance?

Overtaking Sight Distance is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Overtaking Sight Distance can be measured.

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Overtaking Sight Distance Formula

​GoOvertaking Sight Distance given Minimum Overtaking Distance Formula

Overtaking Sight Distance Example

Overtaking Sight Distance Solution

Overtaking Sight Distance Formula Elements

Other Formulas to find Overtaking Sight Distance on road

Other formulas in OSD category

How to Evaluate Overtaking Sight Distance?

FAQs on Overtaking Sight Distance

Variable Name

GoOvertaking Sight Distance given Minimum Overtaking Distance Formula