What is OSD in transportation?

What is OSD in transportation?

Overtaking Sight Distance (OSD) is the sight distance required for the faster vehicle to overtake the slower vehicle safely.

What is overtaking zone?

Explanation: Overtaking Zone: Particular zones marked with the wide roads for overtaking operation in the highway when it is not possible to provide overtaking sight distance (OSD) throughout the length. Minimum length of overtaking zone = 3 × OSD.

What defines your sight distance?

Sight distance means the distance from which you can see and identify a hazard. You often see an object before you’re able to identify it as a hazard. If the stopping distance to an object is greater than the sight distance, you’re in danger of hitting the object.

What is OSD in civil engineering?

Over-Taking Sight Distance(OSD):- OSD is the sight distance which is necessary for a vehicle running at the design speed to overtake a slower moving vehicle without collision with the vehicles coming from the opposite direction.

What is the formula of overtaking sight distance?

Overtaking Sight Distance (OSD) d2 = Distance traveled by the vehicle A from A2 to A3 during the actual overtaking operation in time T sec. where S = Minimum spacing between two vehicles. s = 0.2Vb+6 here Vb is in km/hr.

What do overtaking mean?

1a : to catch up with. b : to catch up with and pass by. 2 : to come upon suddenly.

How is sight distance measured?

The Intersection Sight Distance (ISD) is measured along the major road beginning at a point that coincides with the location of the minor road vehicle.

What are the different sight distances?

There are 5 types of sight distances: Overtaking Sight Distance. Intermediate Sight Distance. Head Light Sight Distance. Sight Distance @ intersections.

What is overtaking sight distance formula?

What are different sight distances?

Following `types of sight distances are considered for geometrical design of road : Stopping or non-passing sight distance. Overtaking or passing sight distance. Intermediate sight distance.

How do you calculate safe overtaking distance?

What is the overtaking sight distance in driving?

The overtaking sight distance is also called as the passing sight distance that will be measured along the center line of the road. This is the line level over which the driver keeping an eye level of 1.2 m above the road level can easily see the top of the object 1.2 m above the road surface.

What are the standards for sight distance?

The standards for sight distance should satisfy the following conditions : Driver travelling at the design speed has sufficient sight distance or road length visible to stop vehicle, in case of any obstruction on the road ahead, without collision.

What is meant by lateral sight distance?

Lateral sight distance. 1. Stopping or Non-passing Sight Distance : The clear distance ahead needed by a driver to bring his vehicle to a stop before meeting a stationary object on the road is called as stopping or non-passing sight distance. Below are given some of the examples of sight distance at various situations of road. 1.

What is the speed of overtaking on two-way traffic?

Q) The speed of overtaking and the overtaken vehicle is 80kmph and 65 kmph respectively on two-way traffic. The acceleration of the overtaking vehicle is 3.6 kmph. Calculate. (i) Safe overtaking sight distance. (ii) Minimum and desirable overtaking zone. Let us assume total reaction time = 2 seconds. = 36.1 meter.